Exploration of Mars

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The exploration of Mars has been an important part of the space exploration programs of the Soviet Union (later Russia), the United States, Europe, and Japan. Dozens of robotic spacecraft, including orbiters, landers, and rovers, have been launched toward Mars since the 1960s. These missions were aimed at gathering data about current conditions and answering questions about the history of Mars. The questions raised by the scientific community are expected to not only give a better appreciation of the red planet but also yield further insight into the past, and possible future of Earth.

The exploration of Mars has come at a considerable financial cost with roughly two-thirds of all spacecraft destined for Mars failing before beginning or completing their missions. Such a high failure rate can be attributed to the complexity and large number of variables involved in an interplanetary journey, and has led researchers to jokingly speak of The Great Galactic Ghoul ^[1] which subsists on a diet of Mars probes. This phenomenon is also widely known as the Mars Curse. ^[2]

Contents 1 Questions to explore 2 Launch windows 3 Early flyby probes and orbiters 3.1 Early Soviet missions 3.2 Mariner program 4 Landers and later missions 4.1 Mars probe program 4.2 Viking program 4.3 Phobos program 4.4 Mars Global Surveyor 4.5 Mars Pathfinder 4.6 Spate of failures 4.7 Mars Odyssey 4.8 Mars Express and Beagle 2 4.9 Mars Exploration Rovers 4.10 Mars Reconnaissance Orbiter 4.11 Rosetta and Dawn 4.12 Future Missions 5 Interactive map of Mars Landings 6 Mars Curse 7 Manned missions 8 Timeline of Mars exploration 8.1 Planned missions 8.2 Cancelled missions 9 See also 10 Further reading 11 References 12 External links

[edit] Questions to explore

Mars has long been the subject of human fascination. Early telescopic observations revealed color changes on the surface which were originally attributed to seasonal vegetation as well as linear features which were ascribed to intelligent design. These early and erroneous interpretations led to widespread public interest in Mars. Further telescopic observations found Mars' two moons - Phobos and Deimos, dry channels and depressions, polar ice caps, Olympus Mons, the solar system's tallest mountain, and Valles Marineris, the solar system's largest canyon system. These discoveries have only piqued further interest in the study and exploration of the red planet. Mars is a rocky planet, like Earth, that formed around the same time, yet with only half the diameter of Earth and a cold and desert-like surface. Among the questions asked by scientists are the following:

1. How does the composition of Mars differ from the Earth's and how have the two planets evolved differently?
2. How does the composition and state of the interior of Mars differ from the Earth's?
3. Is Mars still geologically active?
4. What natural resources are available at the surface for future human use?
5. Was there an early dense atmosphere on Mars?
6. Did Mars once have oceans?
7. What changes in climate has Mars experienced over its geologic history and what caused those changes?
8. How stable is the climate of Mars today?
9. Did chemical evolution take place on Mars, leading to the formation of prebiotic organic molecules?
10. Did chemical evolution lead to the formation of replicating molecules, i.e. life?
11. If life once arose, is it to be found anywhere on Mars today?
12. How did Phobos and Deimos come to be where they are? What geology and resources do they possess?

[edit] Launch windows

In order to understand the history of the robotic exploration of Mars it is important to note that launch windows occur at intervals of 2.135 years, i.e. 780 days (the planet's synodic period). Launch windows were / will be in:

• November 1996 to December 1996
• December 1998 to January 1999
• April 2001
• June to July 2003
• August 2005
• October 2007
• December 2009
• February 2012

[edit] Early flyby probes and orbiters

[edit] Early Soviet missions

The Marsnik program, was the first Soviet unmanned spacecraft interplanetary exploration program, which consisted of two flyby probes launched towards Mars in October 1960, Marsnik 1 and 2 dubbed Mars 1960A and Mars 1960B (also known as Korabl 4 and Korabl 5 respectively). After launch, the third stage pumps on both Marsnik launchers were unable to develop enough thrust to commence ignition, so Earth parking orbit was not achieved. The spacecraft reached an altitude of 120 km before reentry.

Mars 1962A a Mars fly-by mission, launched on October 24, 1962 and Mars 1962B a lander mission, launched in late December of the same year both failed from either breaking up as they were going into Earth orbit or having the upper stage explode in orbit during the burn to put the spacecraft into the Mars trajectory.

Mars 1 (1962 Beta Nu 1) an automatic interplanetary station launched to Mars on November 1, 1962 was the first probe of the Soviet Mars probe program. Mars 1 was intended to fly by the planet at a distance of about 11,000 km and take images of the surface as well as send back data on cosmic radiation, micrometeoroid impacts and Mars' magnetic field, radiation environment, atmospheric structure, and possible organic compounds. Sixty-one radio transmissions were held, initially at two day intervals and later at 5 days in which a large amount of interplanetary data was collected. On 21 March 1963, when the spacecraft was at a distance of 106,760,000 km from Earth, on its way to Mars, communications ceased, due to failure of the spacecraft's antenna orientation system.

In 1964, both Soviet probe launches, of Zond 1964A on June 4, and Zond 2 on November 30, (part of the Zond program), resulted in failures. Zond 1964A had a failure at launch, while communication was lost with Zond 2 en route to Mars after a mid-course maneuver, in early May 1965.

[edit] Mariner program

In 1964, NASA's Jet Propulsion Laboratory made two attempts at reaching Mars. Mariner 3 and Mariner 4 were identical spacecraft designed to carry out the first flybys of Mars. Mariner 3 was launched on November 5, 1964, but the shroud encasing the spacecraft atop its rocket failed to open properly, and it failed to reach Mars. Three weeks later, on November 28, 1964, Mariner 4 was launched successfully on an eight-month voyage to the red planet.

Mariner 4 flew past Mars on July 14, 1965, providing the first close-up photographs of another planet. The pictures, gradually played back to Earth from a small tape recorder on the probe, showed lunar-type impact craters.

NASA continued the Mariner program with another pair of Mars flyby probes at the next launch window. These probes reached the planet in 1969. See Mariner 6 and 7 for details. During the following launch window the Mariner program again suffered the loss of one of a pair of probes. Mariner 9 successfully entered orbit about Mars, after the launch time failure of its sister ship, Mariner 8. When Mariner 9 reached Mars, it and two Soviet orbiters (Mars 2 and Mars 3, see Mars probe program below) found that a planet-wide dust storm was in progress. The mission controllers used the time spent waiting for the storm to clear to have the probe rendezvous with, and photograph, Phobos. When the storm cleared sufficiently for Mars' surface to be photographed by Mariner 9, the pictures returned represented a substantial advance over previous missions. These pictures were the first to offer evidence that liquid water might at one time have flowed on the planetary surface.

[edit] Landers and later missions

[edit] Mars probe program

Main article: Mars probe program

In 1969, the Soviet Union prepared a 5-ton orbiter called M-69. Two copies of the probe were lost in launch related complications caused by problems with the newly developed Proton rockets ^[3].

In 1971, shortly after the Cosmos 419 probe was lost in the fourth stage of the launch due to issues concerning the failure in the separation of Cosmos' payload from the launch vehicle^[4], the Soviet Union successfully sent probes Mars 2 and Mars 3, as part of the Mars probe program. The Mars 2 and 3 probes each carried a lander, both of which failed upon landing. They were the first human artefacts to touch down on Mars. Mars 3 lander however, still managed to transmit a portion of the first picture from Martian surface.

The Mars 2 and 3 orbiters sent back a large volume of data covering the period from December 1971 to March 1972, although transmissions continued through to August. By 22 August 1972, after sending back data and a total of 60 pictures, Mars 2 and 3 concluded their missions. The images and data enabled creation of surface relief maps, and gave information on the Martian gravity and magnetic fields^[5].

In 1973, the Soviet Union sent four more probes to Mars: the Mars 4 and Mars 5 orbiters and the Mars 6 and Mars 7 fly-by/lander combinations. All missions except Mars 7 sent back data, with Mars 5 being most successful. Mars 5 transmitted 60 images before a loss of pressurization in the transmitter housing, ended the mission. Mars 6 lander transmitted data during descent, but failed upon impact. Mars 4 flew by the planet at a range of 2200 km returning one swath of pictures and radio occultation data, which constituted the first detection of the nightside ionosphere on Mars ^[6]. Mars 7 probe separated prematurely from the carrying vehicle due to a problem in the operation of one of the onboard systems (altitude control or retro-rockets) and missed the planet by 1300 km.

[edit] Viking program

Main article: Viking program

In 1976 the two Viking probes entered orbit about Mars and each released a lander module that made a successful soft landing on the planet's surface. The two missions returned the first color pictures and extensive scientific information. Measured temperatures at the landing sites ranged from 150 to 250 K, with a variation over a given day of 35 to 50 K. Seasonal dust storms, pressure changes, and movement of atmospheric gases between the polar caps were observed. A biology experiment produced possible evidence of life, but it was not corroborated by other on-board experiments. Most scientists believe there currently is no life on Mars.

While searching for a suitable landing spot for Viking 2's lander, the Viking 1 orbiter photographed the landform that constitutes the so-called "Face on Mars" on July 25, 1976.

The Viking program was a descendant of the cancelled Voyager program, whose name was later reused for a pair of outer solar system probes.

[edit] Phobos program

Main article: Phobos program

Two Soviet probes were sent to Mars in 1988 as part of the Phobos program. Phobos 1 operated nominally until an expected communications session on 2 September 1988 failed to occur. The problem was traced to a software error, which deactivated altitude thrusters causing the spacecrafts' solar arrays to no longer point at the Sun, depleting Phobos 1 batteries. Phobos 2 operated nominally throughout its cruise and Mars orbital insertion phases on January 29, 1989, gathering data on the Sun, interplanetary medium, Mars, and Phobos. Shortly before the final phase of the mission, during which the spacecraft was to approach within 50 m of Phobos' surface and release two landers, one a mobile 'hopper', the other a stationary platform, contact with Phobos 2 was lost. The mission ended when the spacecraft signal failed to be successfully reacquired on March 27, 1989. The cause of the failure was determined to be a malfunction of the on-board computer.

[edit] Mars Global Surveyor

Main article: Mars Global Surveyor

After the 1992 failure of NASA's Mars Observer orbiter, NASA retooled and launched Mars Global Surveyor. This mission was the first successful United States mission, and the first fully successful mission overall, to the red planet in two decades when it launched November 7, 1996, and entered orbit on September 12, 1997. After a year and a half trimming its orbit from a looping ellipse to a circular track around the planet, the spacecraft began its primary mapping mission in March 1999. It has observed the planet from a low-altitude, nearly polar orbit over the course of one complete Martian year, the equivalent of nearly two Earth years. Mars Global Surveyor completed its primary mission on January 31, 2001, and completed several extended mission phases.

The mission has studied the entire Martian surface, atmosphere, and interior, and has returned more data about the red planet than all other Mars missions combined. These valuable data are archived and available publicly.^[7]

Among key scientific findings so far, Global Surveyor has taken pictures of gullies and debris flow features that suggest there may be current sources of liquid water, similar to an aquifer, at or near the surface of the planet. Similar channels on Earth are formed by flowing water, but on Mars the temperature is normally too cold and the atmosphere too thin to sustain liquid water. Nevertheless, many scientists hypothesize that liquid groundwater can sometimes surface on Mars, erode gullies and channels, and pool at the bottom before freezing and evaporating.

Magnetometer readings show that the planet's magnetic field is not globally generated in the planet's core, but is localized in particular areas of the crust. New temperature data and closeup images of the Martian moon Phobos show its surface is composed of powdery material at least 1 metre (3 feet) thick, caused by millions of years of meteoroid impacts. Data from the spacecraft's laser altimeter have given scientists their first 3-D views of Mars' north polar ice cap.

On the November 5, 2006 MGS lost contact with Earth and hasn't been heard from since.^[8]

[edit] Mars Pathfinder

Main article: Mars Pathfinder

The Mars Pathfinder spacecraft, launched one month after Global Surveyor, landed on July 4, 1997. Its landing site was an ancient flood plain in Mars' northern hemisphere called Ares Vallis, which is among the rockiest parts of Mars. It carried a tiny remote-controlled rover called Sojourner, which traveled a few meters around the landing site, exploring the conditions and sampling rocks around it. Newspapers around the world carried images of the lander dispatching the rover to explore the surface of Mars in a way achieved only twice previously by the Russian Lunokhod rovers on the moon 30 years before (the Lunokhods covered considerably greater distances also: 11 km and 37 km, repectively).

Until the final data transmission on September 27, 1997, Mars Pathfinder returned 16,500 images from the lander and 550 images from the rover, as well as more than 15 chemical analyses of rocks and soil and extensive data on winds and other weather factors. Findings from the investigations carried out by scientific instruments on both the lander and the rover suggest that Mars was at one time in its past warm and wet, with water existing in its liquid state and a thicker atmosphere. The mission website was the most heavily-trafficked up to that time.

[edit] Spate of failures

Mars 96, an orbiter launched on November 16, 1996 by Russia failed, when the planned second burn of the Block D-2 fourth stage did not occur.

Following the success of Global Surveyor and Pathfinder, another spate of failures occurred in 1998 and 1999, with the Japanese Nozomi orbiter and NASA's Mars Climate Orbiter, Mars Polar Lander, and Deep Space 2 penetrators all suffering various fatal errors. Mars Climate Orbiter is infamous for Lockheed Martin engineers mixing up the usage of imperial units with metric units, causing the orbiter to burn up while entering Mars' atmosphere.

[edit] Mars Odyssey

Main article: Mars Odyssey

In 2001 the run of bad luck ended when NASA's Mars Odyssey orbiter arrived. Its mission is to use spectrometers and imagers to hunt for evidence of past or present water and volcanic activity on Mars. In 2002, it was announced that the probe's gamma ray spectrometer and neutron spectrometer had detected large amounts of hydrogen, indicating that there are vast deposits of water ice in the upper three meters of Mars' soil within 60° latitude of the south pole.

[edit] Mars Express and Beagle 2

Main article: Mars Express

Main article: Beagle 2

On June 2, 2003, the European Space Agency's Mars Express set off from Baikonur Cosmodrome to Mars. The Mars Express craft consists of the Mars Express Orbiter and the lander Beagle 2. Although the landing probe was not designed to move, it carried a digging device and the smallest mass spectrometer created to date, as well as a range of other devices, on a robotic arm in order to accurately analyse soil beneath the dusty surface.

The orbiter entered Mars orbit on December 25, 2003, and Beagle 2 entered Mars' atmosphere the same day. However, attempts to contact the lander failed. Communications attempts continued throughout January, but Beagle 2 was declared lost in mid-February, and a joint inquiry was launched by the UK and ESA. Nevertheless, Mars Express Orbiter confirmed the presence of water ice and carbon dioxide ice at the planet's south pole. NASA had previously confirmed their presence at the north pole of Mars.

[edit] Mars Exploration Rovers

Main article: Mars Exploration Rovers

Shortly after the launch of Mars Express, NASA sent a pair of twin rovers toward the planet as part of the Mars Exploration Rover Mission. On 10 June 2003, NASA's MER-A (Spirit) Mars Exploration Rover was launched. It successfully landed in Gusev Crater (believed once to have been a crater lake) on 3 January 2004. It examined rock and soil for evidence of the area's history of water. On July 7, 2003, a second rover, MER-B (Opportunity) was launched. It landed on 24 January 2004 in Meridiani Planum (where there are large deposits of hematite, indicating the presence of past water) to carry out similar geological work.

Despite a temporary loss of communication with the Spirit Rover (caused by too many files being stored in its flash memory[1]) delaying exploration for several days, both rovers eventually began exploring their landing sites. The rover Opportunity landed in a particularly interesting spot, a crater with bedrock outcroppings. In fast succession mission team members announced on 2 March that data returned from the rover showed that these rocks were once "drenched in water", and on 23 March that it was concluded that they were laid down underwater in a salty sea. This represented the first strong direct evidence for liquid water being on Mars at some time in the past.

Towards the end of July 2005, it was reported by the Sunday Times that the rovers may have carried the bacteria Bacillus safensis to Mars. According to one NASA microbiologist, this bacteria could survive both the trip and conditions on Mars. A book containing this claim, Out of Eden by Alan Burdick, is due to be published in the United Kingdom. Despite efforts to sterilise both landers, neither could be assured to be completely sterile.^[9]

As of January 2007, both rovers are still healthy, though starting to show their ages in ways that require occasional intervention from Earth, and discovering new things, including Heat Shield Rock, the first meteorite to be discovered on another planet.

[edit] Mars Reconnaissance Orbiter

Main article: Mars Reconnaissance Orbiter

Mars Reconnaissance Orbiter is a multipurpose spacecraft designed to conduct reconnaissance and exploration of Mars from orbit. The $720 million USD spacecraft was built by Lockheed Martin under the supervision of the Jet Propulsion Laboratory, launched August 12, 2005, and attained Martian orbit on March 10, 2006.

The MRO contains a host of scientific instruments such as the HiRISE camera, CRISM, and SHARAD. The HiRISE camera is used to analyze Martian landforms, whereas CRISM and SHARAD can detect water, ice, and minerals on and below the surface. Additionally, MRO is paving the way for upcoming generations of spacecraft through daily monitoring of Martian weather and surface conditions, searching for future landing sites, and testing a new telecommunications system that will enable the orbiter to send and receive information at an unprecedented bitrate. Data transfer to and from the spacecraft will occur faster than all previous interplanetary missions combined and allowing it to serve as an important relay satellite for future missions.

[edit] Rosetta and Dawn

The ESA Rosetta space probe mission to the comet 67P/Churyumov-Gerasimenko flew within 250 km of Mars on February 25, 2007 in a gravitational slingshot designed to slow and redirect the spacecraft.^[10] The NASA Dawn spacecraft will also use the gravity of Mars to change direction and velocity, and will briefly do a little science in conjunction with the many probes already there. Dawn is scheduled to pass the red planet in 2009.

[edit] Future Missions

The next mission to Mars is the Phoenix Mars lander, expected to launch in 2007.

It should be followed by a (or a couple of) more capable rover(s) in 2009 or 2011 and by the European ExoMars mission in 2014. The Exomars mission should obtain soil samples from up to 2 meters depth and make an extensive search for organic and biochemical substances.

A second Scout mission, Mars 2011 should also be selected soon for 2011.

In addition, NASA plans to launch a proposed rover, the Astrobiology Field Laboratory in 2016.

Russia is still planning to launch its Phobos-Grunt probe in 2009.

[edit] Interactive map of Mars Landings

The following map has been wiki-linked! Click on the landers and features and you will be taken to the corresponding Wikipedia pages.

[edit] Mars Curse

The high failure rate of America's NASA and other nations' space agencies in their attempts to explore Mars has become known as the Mars Curse. See below for a full list of launch attempts to Mars.

By the spring of 2006, of 37 launch attempts to reach the planet, only 18 succeeded. Eleven of the missions included attempts to land on the surface, but only six transmitted data once after landing. Some suggest, mostly in jest, that there is actually some force trying to prevent or punish the exploration of Mars. The Galactic Ghoul is a fictional space monster that consumes Mars probes, a term coined in 1997 by Time Magazine journalist Donald Neff.^[11][12][13]

v • d • e Failed & Cancelled missions to the Planet Mars
Failed:	Marsnik program | Sputnik 22 | Mars 1 | Sputnik 24 | Mariner 3 | Zond 2 | Mars 1969A | Mars 1969B | Mariner 8 | Cosmos 419 | Mars 6 | Mars 7 | Phobos 1 | Mars Observer | Mars 96 | Nozomi | Mars Climate Orbiter | Mars Polar Lander | Deep Space 2 | Beagle 2
Cancelled:	Voyager | Mars Surveyor 2001 Lander | NetLander | Mars Telecommunications Orbiter

[edit] Manned missions

Many people have long advocated a manned mission to Mars as the next logical step for a manned space program after lunar exploration. Aside from the prestige such a mission would bring, advocates argue that humans would be easily able to outperform robotic explorers, justifying the expenses. Eugene F. Lally of Caltech for NASA's Jet Propulsion Laboratory designed manned Mars missions and presented them at American Rocket Society conventions as early as 1959. In another paper Lally proposed a simulated gravity concept that would protect the astronauts during the prolonged weightlessness of the flight to Mars. The paper titled "To Spin or Not to Spin" proposed separating two main segments of the spacecraft connected by cables and spun up to simulate gravity. In the center of rotation Lally placed an all-optical guidance module to provide real time onboard navigation to the astronauts, this paper was titled "Mosaic Guidance for Interplanetary Travel" 1961.

Werner Von Braun advocated a manned mission to Mars as a focus for NASAs manned space program following completion of the Apollo Program. Von Braun's proposal used Saturn V boosters to launch nuclear powered upper stages that would power two six crew space craft on a dual mission in the early 1980s. The proposal was considered by Richard Nixon but passed over in favor of the Space Shuttle.

Because of the distance between Mars and Earth, the mission would be much more risky and more expensive than past manned flights to the Moon. Supplies and fuel would have to be prepared for a 2-3 year round trip and the spacecraft would have to be designed with at least partial shielding from intense solar radiation. A proposal called Mars Direct, advocated by Robert Zubrin of the Mars Society, is believed by many to be the most practical and affordable plan for a manned Mars mission. A ground-based biomedical experiment Mars-500 simulating manned flight to Mars will start in 2007 in Russia.

United States President George W. Bush announced an initiative of manned space exploration on January 14, 2004, known as the Vision for Space Exploration. It includes a manned return to the moon by 2015 at the earliest, and suggests that manned missions to Mars may become a possibility at some point in the future. The European Space Agency has the long-term vision of sending a human mission to Mars by 2030, the Aurora Program.

Many scientists have argued that attempting manned flight to Mars would actually be counterproductive for science. For example, in 2004 the American Physical Society, the world's second-largest organization of physicists, stated that "shifting NASA priorities toward risky, expensive missions to the moon and Mars will mean neglecting the most promising space science efforts" [2]. Moreover, given the rapidly advancing capabilities of robotic explorers, including their demonstrated ability to carry out continuous observations during multi-year sojourns on the hostile Martian surface, it is not obvious that human explorers would actually return more science data for the dollar.

In the even longer term (centuries hence), some scientists believe Mars to be a good candidate for terraforming and human colonization, though other prominent skeptics (such as Robert L. Park) dispute the practicality of both. Many scientists have argued that if life is found on Mars, all human activities on the planet should be carried out with the goal of preservation in mind. Others argue that the presence of life on Mars would imply that life is prevalent throughout the universe; decreasing the relative importance of Martian microbes.

[edit] Timeline of Mars exploration

Dates listed are spacecraft launch dates.

Mission	Launch	Termination	Objective	Result
Marsnik 1 (Mars 1960A)	10 October 1960	10 October 1960	Flyby	Launch failure
Marsnik 2 (Mars 1960B)	14 October 1960	14 October 1960	Flyby	Launch failure
Sputnik 22 (Mars 1962A)	24 October 1962	24 October 1962	Flyby	Broke up shortly after launch
Mars 1	1 November 1962	21 March 1963	Flyby	Some data collected, but lost contact before reaching Mars
Zond 1964A	4 June 1964	? June 1964	Flyby	Launch Failure
Sputnik 24 (Mars 1962B)	4 November 1962	January 1963	Lander	Failed to leave Earth's orbit
Mariner 3	5 November 1964	5 November 1964	Flyby	Failure during launch ruined trajectory. Currently in solar orbit.
Mariner 4	28 November 1964	21 December 1967	Flyby	Success
Zond 2	30 November 1964	May 1965	Flyby	Lost contact
Mariner 6	25 February 1969	August 1969	Flyby	Success
Mariner 7	27 March 1969	August 1969	Flyby	Success
Mars 1969A	27 March 1969	27 March 1969	Orbiter	Launch failure
Mars 1969B	2 April 1969	2 April 1969	Orbiter	Launch failure
Mission	Launch	Termination	Objective	Result
Mariner 8	8 May 1971	8 May 1971	Orbiter	Launch failure
Cosmos 419	10 May 1971	12 May 1971	Orbiter	Launch failure
Mars 2	19 May 1971	22 August 1972	Orbiter	Success
		27 November 1971	Rover[14]	Crash landed on surface of Mars
Mars 3	28 May 1971	22 August 1972	Orbiter	Success
		2 December 1971	Rover[14]	Landed softly, but ceased transmission within seconds
Mariner 9	30 May 1971	May 1972	Orbiter	Success
Mars 4	21 July 1973	February 1974	Orbiter	Did not enter orbit, but made a close flyby
Mars 5	25 July 1973	21 February 1974	Orbiter	Partial success. Entered orbit, and returned data, but failed within 9 days
Mars 6	5 August 1973	12 March 1974	Lander	Partial success. Data returned during descent, but not after landing on Mars
Mars 7	9 August 1973	9 March 1974	Lander	Landing probe separated prematurely; entered heliocentric orbit.
Viking 1	20 August 1975	17 August 1980	Orbiter	Success
		13 November 1982	Lander	Success
Viking 2	9 September 1975	25 July 1978	Orbiter	Success
		11 April 1980	Lander	Success
Phobos 1	7 July 1988	2 September 1988	Orbiter	Contact lost en route to Mars
			Phobos lander	Not deployed
Phobos 2	12 July 1988	27 March 1989	Orbiter	Partial success: entered orbit and returned some data. Contact lost just before deployment of landers
			2 Phobos landers	Not deployed
Mission	Launch	Termination	Objective	Result
Mars Observer	25 September 1992	21 August 1993	Orbiter	Lost contact just before arrival
Mars Global Surveyor	7 November 1996	5 November 2006	Orbiter	Success
Mars 96	16 November 1996	17 November 1996	Orbiter / landers	Launch failure
Mars Pathfinder	4 December 1996	27 September 1997	Lander / rover	Success
Nozomi (Planet-B)	3 July 1998	9 December 2003	Orbiter	Complications en route; Never entered orbit
Mars Climate Orbiter	11 December 1998	23 September 1999	Orbiter	Crash landed on surface due to metric-imperial mix-up
Mars Polar Lander	3 January 1999	3 December 1999	Lander	Lost contact just before arrival
Deep Space 2 (DS2)			Landers
Mission	Launch	Termination	Objective	Result
2001 Mars Odyssey	7 April 2001	Currently operational	Orbiter	Success
Mars Express Orbiter	2 June 2003	Currently operational	Orbiter	Success
Beagle 2		25 December 2003	Lander	Lost contact upon landing
Spirit rover	10 June 2003	Currently operational	Rover	Success
Opportunity rover	7 July 2003	Currently operational	Rover	Success
Mars Reconnaissance Orbiter	12 August 2005	Currently operational	Orbiter	Success

[edit] Planned missions

• Dawn - July 2007- Gravity assist on way to minor planets Vesta and Ceres (NASA)
• Phoenix - August 2007 - Small Mars scout lander (NASA)
• Phobos-Grunt - October 2009 - Mars orbiter and Phobos sample return (RKA)
• Mars Science Laboratory - 2009 - Mars Rover (NASA)
• Beagle 2: Evolution - 2009 - Mars Lander (ESA)

• Mars 2011 - 2011 - Mars Scout mission (NASA)
• Mars Science and Telecommunications Orbiter - 2011 or 2013 - Mars Orbiter^[15] (NASA)
• ExoMars - 2014 - Mars Rover (ESA)
• Astrobiology Field Laboratory - 2016 - Mars Rover - proposed (NASA)
• Mars Sample Return Mission - delayed until at least 2016, more probably to 2024 - planned mission by ESA and NASA as part of the Aurora Programme

[edit] Cancelled missions

• Voyager - 1970s - Two orbiters and two landers, launched by a single Saturn V rocket.
• Mars Surveyor 2001 Lander - October 2001 - Mars lander to be aboard 2001 Mars Odyssey
• NetLander - 2007 or 2009 - Mars netlanders
• Mars Telecommunications Orbiter - September 2009 - Mars orbiter for telecommunications
• Mars airplane micromission, planned for December 17, 2003, the centennial of the Wright brother's first flight.

[edit] See also

• List of artificial objects on Mars
• Atmospheric reentry
• Space colonization
• New Frontiers Program
• Mars Scout Program
• Timeline of solar system exploration

• Exploration of Mercury
• Exploration of Venus
• Exploration of the Moon
• Exploration of Jupiter

v • d • e Mars Spacecraft Missions
Flybys: Mariner 4 | Mariner 6 | Mariner 7 | Mars 4 | Rosetta
Orbiters: Mariner 9 | Mars 2 | Mars 3 | Mars 5 | Mars 6 | Viking 1 | Viking 2 | Phobos 2 | Mars Global Surveyor | Mars Odyssey | Mars Express Orbiter | Mars Reconnaissance Orbiter
Landers and Rovers: Mars 3 | Viking 1 | Viking 2 | Mars Pathfinder | Spirit rover | Opportunity rover
Future: Dawn (2007) | Phoenix Scout (2007) | Mars Science Laboratory (2009) | Phobos-Grunt (2009) | Mars 2011 | ExoMars (2013) | Astrobiology Field Laboratory (2016?)
See also: Mars | Exploration of Mars | Colonization of Mars

[edit] Further reading

• Mars - A Warmer, Wetter Planet by Jeffrey S. Kargel (published July 2004; ISBN 978-1-85233-568-7)
• The Compact NASA Atlas of the Solar System by Ronald Greeley and Raymond Batson (published January 2002; ISBN 0-5218-0633-X)

[edit] References

[edit] External links

• MarsDrive Consortium Reference Mission Design and Mars Advocacy
• WhatOnMars Latest Mars News & Images
• Mars Odyssey News Constellation Program news
• marsgeo.com Mars rover videos, photos, detailed analysis of surface geology
• space.com Mars Rovers site
• exploreMarsnow Interactive Mars base simulation. Winner of 2003 Webby Award for Science.
• Next on Mars (Bruce Moomaw, Space Daily, 9 March 2005): An extensive overview of NASA's Mars exploration plans
• [3] Mars Exploration Program Analysis Group at Jet Propulsion Laboratory
• Catalog of Soviet Mars images Collection of Russian mars-probe images.
• Mars balloon