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Computer-generated image of one of the two Mars Exploration Rovers which touched down on Mars in 2004.
Real image from Mars, part of a panorama taken by the Spirit rover in 2004
Heat Shield Rock (Meridiani Planum) is examined by Opportunity rover (MER-B) in 2005

The exploration of Mars has been an important part of the space exploration programs of the Soviet Union, 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 as well as a preparation for a possible human mission to 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 completing their missions, with some failing before they even begin. 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 informally known as the Mars Curse.[2] As of January 2010, there are two functioning pieces of equipment on the surface of Mars beaming signals back to Earth: the Spirit rover and the Opportunity rover.

In October 2009, an agreement signed between United states' space agency, NASA, and Europe's space agency, ESA in order to increase cooperation and expand collective capabilities, resources and expertise to continue the exploration of Mars; this agreement is named the Mars Joint Exploration Initiative (MEJI).[3][4]


The planet Mars

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 apparent 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, the polar ice caps and the feature now known as Olympus Mons, the solar system's tallest mountain.[5] These discoveries 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 far thinner atmosphere, it has a cold and desert-like surface. It is notable, however, that although the planet has only one quarter of the surface area of the Earth, it has about the same land area, since only one quarter of the surface area of the Earth is land.

Launch windows

In order to understand the history of the robotic exploration of Mars it is important to note that minimum-energy launch windows occur at intervals of approximately 2.135 years, i.e. 780 days (the planet's synodic period with respect to Earth). This is a consequence of the Hohmann transfer orbit for minimum-energy interplanetary transfer. The slight inclination and eccentricity of Mars' orbit relative to Earth's orbit means that the minimum energy launch date differs from that implied by the synodic period slightly. Launch window width is subject to vehicle constraints but are typically on the order of one month wide. The windows for recent/future years were/will be centred on the following dates:

  • 18 November 1996 (MJD 50405)
  • 22 January 1999 (MJD 51200)
  • 19 April 2001 (MJD 52018)
  • 5 June 2003 (MJD 52795)
  • 10 August 2005 (MJD 53592)
  • 21 September 2007 (MJD 54364)
  • 15 October 2009 (MJD 55119)
  • 7 November 2011 (MJD 55872)
  • 2 January 2014 (MJD 56659)

Minimum energy inbound (Mars to Earth) launch windows also occur at similar intervals.

In addition to these minimum-energy trajectories, which occur when the planets are aligned so that the Earth to Mars transfer trajectory goes halfway around the Sun, an alternate trajectory which has been proposed goes first inward toward Venus orbit, and then outward, resulting in a longer trajectory which goes about 360 degrees around the Sun ("opposition-class trajectory").

Early flyby probes and orbiters


Early Soviet missions

Marsnik spacecraft

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.

The USSR intended to have the first artificial satellite of Mars beating the planned American Mariner 8 and Mariner 9 martian orbiters. But on May 5, 1971 Cosmos 419 (Mars 1971C), a heavy probe of Soviet Mars probe progam M-71, failed on launch. This spacecraft was designed as an orbiter only while the second and third probes of project M-71, Mars 2 and Mars 3, were multi-aimed combinations of orbiter and lander.

Mariner program

Taken from Mariner 4, the first close-up image ever taken of Mars shows an area about 330 km across by 1200 km from limb to bottom of frame.
Mariner Crater, as seen by Mariner 4. The location is Phaethontis quadrangle.

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 a 7½-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, Mariner 6 and 7, at the next launch window. These probes reached the planet in 1969. 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, the first spacecraft ever to do so, 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.

Viking program

The Viking Orbiters caused a revolution in our ideas about water on Mars. Huge river valleys were found in many areas. They showed that floods of water broke through dams, carved deep valleys, eroded grooves into bedrock, and traveled thousands of kilometers. Areas of branched streams, in the southern hemisphere, suggested that rain once fell.[6][7][8]

The images below, some of the best from the Viking Orbiters, are mosaics of many small, high resolution images. Click on the images for more detail. Some of the pictures are labeled with place names.

Surface missions

The following is a map of landings on Mars.

Tharsis Montes Hellas Planitia Olympus Mons Valles Marineris Arabia Terra Amazonis Planitia Elysium Mons Isidis Planitia Terra Cimmeria Argyre Planitia Alba Patera Map of Mars
About this image
Viking 1
Viking 2
The first image transmitted by the Viking 1 Lander from the surface of Mars, showing the craft's footpad.

The Soviet Union intended to beat the USA by sending landers first in the Mars probe program M-69 in 1969, but both probes of the new heavy 5-ton design, Mars 1969A and Mars 1969B, failed at launch.

The first probes to impact and land on Mars were the Soviet Union's Mars 2 and Mars 3, as part of the Mars probe program M-71 in 1971. Each carried a lander. The Mars 2 lander crashed; Mars 3 was the first successful lander but stopped transmitting data and images from the surface after 22 seconds of operation.

Mars 6 and Mars 7 landers on the next Soviet Mars probe program M-73 failed their missions; the first impacted on the surface while the second missed the planet.

The first landers to successfully accomplish their missions were the American Viking 1 and Viking 2.

Mars Curse

The high failure rate of missions launched from Earth attempting to explore Mars has become informally known as the "Mars Curse". The "Galactic Ghoul" is a fictional space monster that consumes Mars probes, a term coined in 1997 by Time Magazine journalist Donald Neff.[9][10][11]

Of 38 launches from Earth in an attempt to reach the planet, only 19 succeeded, a success rate of 50%. Twelve of the missions included attempts to land on the surface, but only seven transmitted data after landing.

The majority of the failed missions occurred in the early years of space exploration and were part of the Soviet and later Russian Mars probe program that suffered several technical difficulties, other than the largely successful Venera program for the exploration of Venus.

Modern missions have an improved success rate; however, the challenge, complexity and length of the missions make it inevitable that failures will occur.[12]

The U.S. NASA Mars exploration program has had a somewhat better record of success in Mars exploration, achieving success in 13 out of 18 missions launched (a 72% success rate), and succeeding in six out of seven (an 86% success rate) of the launches of Mars landers.

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 easily be able to outperform robotic explorers, justifying the expenses. Critics contend, however, that robots can perform better than humans at a fraction of the expense. A list of hypothetical or proposed manned Mars missions proposals is located at manned mission to Mars.

Timeline of Mars exploration

Mission (1960-1969) Launch Arrival at Mars Termination Objective Result
Soviet Union Marsnik 1 (Mars 1960A) 10 October 1960 10 October 1960 Flyby Launch failure
Soviet Union Marsnik 2 (Mars 1960B) 14 October 1960 14 October 1960 Flyby Launch failure
Soviet Union Sputnik 22 (Mars 1962A) 24 October 1962 24 October 1962 Flyby Broke up shortly after launch
Soviet Union Mars 1 1 November 1962 21 March 1963 Flyby Some data collected, but lost contact before reaching Mars
Soviet Union Sputnik 24 (Mars 1962B) 4 November 1962 19 January 1963 Lander Failed to leave Earth's orbit
United States Mariner 3 5 November 1964 5 November 1964 Flyby Failure during launch ruined trajectory. Currently in solar orbit.
United States Mariner 4 28 November 1964 14 July 1965 21 December 1967 Flyby Success (first successful flyby)
Soviet Union Zond 2 30 November 1964 May 1965 Flyby Lost contact
United States Mariner 6 25 February 1969 31 July 1969 August 1969 Flyby Success
United States Mariner 7 27 March 1969 5 August 1969 August 1969 Flyby Success
Soviet Union Mars 1969A 27 March 1969 27 March 1969 Orbiter Launch failure
Soviet Union Mars 1969B 2 April 1969 2 April 1969 Orbiter Launch failure
Mission (1970-1989) Launch Arrival at Mars Termination Objective Result
United States Mariner 8 8 May 1971 8 May 1971 Orbiter Launch failure
Soviet Union Cosmos 419 (Mars 1971C) 10 May 1971 12 May 1971 Orbiter Launch failure
United States Mariner 9 30 May 1971 13 November 1971 27 October 1972 Orbiter Success (first successful orbit)
Soviet Union Mars 2 19 May 1971 27 November 1971 22 August 1972 Orbiter Success
27 November 1971 Lander / rover[13] Crashed on surface of Mars
Soviet Union Mars 3 28 May 1971 2 December 1971 22 August 1972 Orbiter Success
2 December 1971 Lander / rover[13] Partial Success. First successful landing; landed softly, but ceased transmission within 15 seconds.
Soviet Union Mars 4 21 July 1973 10 February 1974 10 February 1974 Orbiter Did not enter orbit, but made a close flyby
Soviet Union Mars 5 25 July 1973 2 February 1974 21 February 1974 Orbiter Partial success. Entered orbit, and returned data, but failed within 9 days
Soviet Union Mars 6 5 August 1973 12 March 1974 12 March 1974 Lander Partial success. Data returned during descent, but not after landing on Mars
Soviet Union Mars 7 9 August 1973 9 March 1974 9 March 1974 Lander Landing probe separated prematurely; entered heliocentric orbit.
United States Viking 1 20 August 1975 20 July 1976 17 August 1980 Orbiter Success
13 November 1982 Lander Success
United States Viking 2 9 September 1975 3 September 1976 25 July 1978 Orbiter Success
11 April 1980 Lander Success
Soviet Union Phobos 1 7 July 1988 2 September 1988 Orbiter Contact lost while on route to Mars
Phobos lander Not deployed
Soviet Union Phobos 2 12 July 1988 29 January 1989 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 (1990-1999) Launch Arrival at Mars Termination Objective Result
United States Mars Observer 25 September 1992 24 August 1993 21 August 1993 Orbiter Lost contact just before arrival
United States Mars Global Surveyor 7 November 1996 11 September 1997 5 November 2006 Orbiter Success
Russia Mars 96 16 November 1996 17 November 1996 Orbiter / landers Launch failure
United States Mars Pathfinder 4 December 1996 4 July 1997 27 September 1997 Lander / rover Success
Japan Nozomi (Planet-B) 3 July 1998 9 December 2003 Orbiter Complications while on route; Never entered orbit
United States Mars Climate Orbiter 11 December 1998 23 September 1999 23 September 1999 Orbiter Crashed on surface due to metric-imperial mix-up
United States Mars Polar Lander 3 January 1999 3 December 1999 3 December 1999 Lander Crash landed on surface due to improper hardware testing
United States Deep Space 2 (DS2) Hard landers
Mission (2000-Present) Launch Arrival at Mars Termination Objective Result
United States 2001 Mars Odyssey 7 April 2001 24 October 2001 Currently operational Orbiter Success
Not the esa logo.png Mars Express 2 June 2003 25 December 2003 Currently operational Orbiter Success
United Kingdom Beagle 2 6 February 2004 Lander Lost contact in December 2003 after separation from Mars Express. Fate unknown.
United States MER-A Spirit 10 June 2003 4 January 2004 Currently operational, stuck Rover Success
United States MER-B Opportunity 7 July 2003 25 January 2004 Currently operational Rover Success
Not the esa logo.png Rosetta 2 March 2004 February 25, 2007 Currently operational Gravity assist enroute to comet 67P/Churyumov-Gerasimenko Success
United States Mars Reconnaissance Orbiter 12 August 2005 10 March 2006 Currently operational Orbiter Success
United States Phoenix 4 August 2007 25 May 2008 10 November 2008 Lander Success
United States Dawn 27 September 2007 Feb. 17, 2009 Currently operational Gravity assist to Vesta (Successful launch; successful to date)
Future missions Launch schedule Estimated arrival at Mars Objective Notes
Russia Phobos-Grunt 2012[14] Orbiter, lander, sample return Will attempt to bring samples of Phobos’ soil back to Earth in 2014 (or 2012).[15][16]
People's Republic of China Yinghuo-1 Orbiter Will travel with the Russian Phobos-Grunt mission
United States MSL Curiosity 15 September 2011 2012 Rover Powered by radioisotopes, it will perform chemical and physical analysis on martian soil and atmosphere.
Finland MetNet 2011-2019 Multi-lander network Simultaneous meteorological measurements at multiple locations.[17]
Canada Northern Light 2012 Lander / rover Solar powered, it will perform chemical and physical analysis on Martian soil and atmosphere.[18]
United States MAVEN 2013 Orbiter Part of the Mars Scout Program
India Mars mission Between 2013-2015[19] Orbiter The ISRO has begun the conceptual phase for an orbiter mission to Mars.[20][21]
United States Astrobiology Field Laboratory Possibly by 2016 Rover Focused on the search for life on Mars, past or present. Being considered but not yet funded or scheduled.
Not the esa logo.png and United States: ExoMars 2016 Orbiter, static lander TGM orbiter will deliver the ExoMars static lander.
2018 Two rovers ExoMars rover and MAX-C rover.
Not the esa logo.png and United States: Mars sample return mission Possibly by 2020 Orbiter, lander, rover, sample return Being considered but not yet funded or scheduled.

Cancelled missions

  • Mars 4NM and Mars 5NM - projects intended by the Soviet Union for heavy Marsokhod (in 1973 according to initial plan of 1970) and Mars sample return (planned for 1975) missions by launching on N1 rocket that has never flown successfully.[22]
  • Voyager - USA, 1970s - Two orbiters and two landers, launched by a single Saturn V rocket.
  • Mars Aerostat - Russian/French balloon mission,[23] originally planned for the 1992 launch window, postponed to 1994 and then to 1996 before being cancelled.[24]
  • Mars Environmental Survey - set of 16 landers planned for 1999-2009
  • Mars-98 - Russian mission including an orbiter, lander, and rover, planned for 1998 launch opportunity
  • Mars Surveyor 2001 Lander - October 2001 - Mars lander
  • Beagle 3 - 2009 British lander mission meant to search for life, past or present.
  • NetLander - 2007 or 2009 - Mars netlanders
  • Mars Telecommunications Orbiter - September 2009 - Mars orbiter for telecommunications
  • Kitty Hawk - Mars airplane micromission, proposed for December 17, 2003, the centennial of the Wright brother's first flight.[25]

See also


  1. ^ Dinerman, Taylor (2004-09-27). "Is the Great Galactic Ghoul losing his appetite?". The space review. Retrieved 2007-03-27. 
  2. ^ Knight, Matthew. "Beating the curse of Mars". Science & Space. Retrieved 2007-03-27. 
  3. ^ "NASA and ESA Establish a Mars Exploration Joint Initiative". NASA. July 8, 2009. Retrieved 2009-11-09. 
  4. ^ "NASA, ESA Set Up Mars Exploration Framework". Aviation Week. July 10, 2009. Retrieved 2009-11-09. 
  5. ^ Sheehan, William (1996). [ "The Planet Mars: A History of Observation and Discovery"]. The University of Arizona Press, Tucson. Retrieved 2009-02-15. 
  6. ^ ISBN 0-8165-1257-4
  7. ^ Raeburn, P. 1998. Uncovering the Secrets of the Red Planet Mars. National Geographic Society. Washington D.C.
  8. ^ Moore, P. et al. 1990. The Atlas of the Solar System. Mitchell Beazley Publishers NY, NY.
  9. ^ "The Depths of Space: The Story of the Pioneer Planetary Probes (2004)" from The National Academies Press. URL accessed April 7, 2006.
  10. ^ "Uncovering the Secrets of Mars" (first paragraph only). Time July 14, 1997 Vol. 150 No. 2. URL accessed April 7, 2006.
  11. ^ Matthews, John & Caitlin. "The Element Encyclopedia of Magical Creatures",Barnes & Noble Publishing, 2005. ISBN 0-7607-7885-X
  12. ^ The "Mars Curse": Why Have So Many Missions Failed?
  13. ^ a b "The First Rover on Mars - The Soviets Did It in 1971" The Planetary Report July/August 1990 issue. URL accessed March 30, 2006.
  14. ^ Russia delays Mars probe launch until 2012
  15. ^ Russia to study Martian moons once again
  16. ^ Russia to Delay Martian Moon Mission
  17. ^ MetNet Mars Mission
  18. ^ "Algonquin Radio Observatory readied as ground station for Northern Light mission". Thoth Technology Inc.. July 27, 2009. Retrieved 2009-07-28. 
  19. ^ ISRO - Future Missions. pp 19
  20. ^ "ISRO gearing up for Mars mission news". Aviation and Aerospace. August 12, 2009. Retrieved 2009-08-20. 
  21. ^ "ISRO Eyes Mission To Mars As Government Sanctions Funding". Mars Daily. August 13, 2009. Retrieved 2009-08-20. 
  22. ^
  23. ^ C. Tarrieu, "Status of the Mars 96 Aerostat Development", Paper IAF-93-Q.3.399, 44th Congress of the International Astronautical Federation, 1993.
  24. ^ P.B. de Selding, "Planned French Balloon May Be Dropped", Space News, 17-23 April 1995, pp. 1, 20
  25. ^ Oliver Morton in To Mars, En Masse, p.1103-04, Science (Magazine) vol 283, 19 february 1999, ISSN 0036-8075

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)
  • Mars: The NASA Mission Reports / edited by Robert Godwin (2000) ISBN 1896522629

External links

Simple English

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.[needs proof]


Dozens of robotic spacecraft, including orbiters, landers, and rovers, have been launched toward Mars since the 1960s.[needs proof]


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