Mars viking mission

Jul 20, 2006 ... The National Aeronautics and Space Administration's (NASA) Viking 1 mission to Mars captured the world's imagination 30 years ago when the ...

Viking landed on Mars July 2O, 1976. Viking 2 landed on Sept. 3. The primary mission ended in early November. The extended mission began in mid-December and is expected to run through May 1978. NOTE: G. Calvin Broome of NASA's Langley Research Center is Viking mission director during the extended mission … Learn more about the Viking mission, the first U.S. project to land and operate spacecraft on the surface of Mars, in this comprehensive press kit from NASA. The pdf document covers the objectives, design, launch, and results of the Viking orbiters and landers, as well as the scientific discoveries and legacy of the mission. Mission name: Viking 1 and 2 Viking Project NASA's Viking Project was the first mission to reach the martian surface and the first to search for evidence of life on Mars. Mission news and discoveries. The Library of Congress presents Space on the Page! March 16, 2022. In Memoriam, Dr. Gil Levin July 30, 2021.NASA's Viking Mission to Mars was composed of two spacecraft, Viking 1 and Viking 2, each consisting of an orbiter and a lander. The primary mission objectives were to obtain high resolution images of the Martian surface, characterize the structure and composition of the atmosphere and surface, and search for evidence of life. Trench Excavated By Surface Sampler. Browse Getty Images' premium collection of high-quality, authentic Viking Mission To Mars stock photos, royalty-free images, and pictures. Viking Mission To Mars stock photos are available in a variety of sizes and formats to fit your needs. Oct 27, 2015 ... This video clip from NASA examines space exploration by the Viking missions to Mars and considers if life can exist on the Red Planet.Oct 30, 1977 · The behavior of Mars as observed by the Viking infrared thermal mapper (IRTM) is considered. The IRTM is a 28-channel, 4-telescope radiometer that operated in six spectral bands. The studies ...Sep 3, 2010 · The Viking mission was planned to continue for 90 days after landing. Each orbiter and lander operated far beyond its design lifetime. Viking Orbiter 1 functioned until July 25, 1978, while Viking Orbiter 2 continued for four years and 1,489 orbits of Mars, concluding its mission August 7, 1980. Because of the …

Mars indeed does have water ice clouds, similar to Earth’s cirrus clouds, both high in the atmosphere and often forming as icy fog just above the ground surface. The Viking orbiter...As of 2014, it takes approximately 150 to 300 days for a spacecraft to travel from Earth to Mars. The time depends on the launch speed, how much fuel is used and the alignment of E...The Viking project was the first planetary exploration mission to transmit pictures from the Martian surface. model of Viking 1. Model of the Viking 1 lander on …Mission: Go to PIAxxxxx: Refine this list of images by: Spacecraft: Instrument: Click on an image for detailed information ... Viking 2 Image of Mars Utopian Plain Full Resolution: TIFF (18.8 MB) JPEG (556.8 kB) 2000-11-04: Mars: Viking: 1124x1040x3: PIA02982: Color Mosaic of Olympus Mons Full ...Jul 20, 2021 · Article. In the summer of 1976, a pair of orbiter and lander spacecraft called Viking arrived at Mars. After first entering orbit, Viking 1’s lander touched down on the Red Planet on July 20. It became the first U.S. spacecraft to land on another planet. Its twin, Viking 2, arrived a few weeks later. The two orbiters and landers operated well ... Mission name: Viking 1 and 2 Viking Project NASA's Viking Project was the first mission to reach the martian surface and the first to search for evidence of life on Mars. Mission news and discoveries. The Library of Congress presents Space on the Page! March 16, 2022. In Memoriam, Dr. Gil Levin July 30, 2021.Jun 30, 2016 ... Interestingly, Viking wasn't the first Mars lander. The Soviet Union had sent Mars 2 and 3 to the planet in 1971. Both stopping working early, ...Sep 30, 2022 · Viking: Directed by Stéphane Lafleur. With Steve Laplante, Larissa Corriveau, Fabiola Nyrva Aladin, Hamza Haq. A behavioral research team observes and attempts to replicate the experiences of the first manned mission to Mars.

Mission: Go to PIAxxxxx: Refine this list of images by: Spacecraft: Instrument: Click on an image for detailed information ... Viking Lander 1's U.S. Flag on Mars Surface Full Resolution: TIFF (93.11 kB) JPEG (13.19 kB) 1997-02-28: Mars: Viking: Camera 2: 498x512x3: PIA00567: Sunset at the Viking ...Aug 6, 2020 · September 3, four Viking Mars spacecraft—two in orbit and two on the surface, were simultaneously collecting new and previously unobtainable data and transmitting that data back to Earth. The first Mars missions, Mariner 4 (passed within 9850 kilometers of Mars on July 14, 1965), Mariner 6 (July 31, 1969) and Mariner …Aug 19, 2010 · Transcript. Reporter: "On August 20, 1975, the first Viking spaceship was launched. Just two weeks later, there was a second Viking launch. Together they began the search for Martian life." Narrator: Two orbiters, two landers, headed for two different locations on the red planet. It was a gutsy mission. "It was one of … Viking 1 was the first successful mission to land on Mars (the Soviet Mars 3 lander survived for a few seconds after landing in 1971, but sent back no science data), operating on Chryse Planitia until November 1982. Viking 2 lander set down on Utopia Planitia and operated until April 1980. Color image of the Martian surface taken by the Viking ... Jul 19, 2006 · Learn more about the Viking mission, the first U.S. project to land and operate spacecraft on the surface of Mars, in this comprehensive press kit from NASA. The pdf document covers the objectives, design, launch, and results of the Viking orbiters and landers, as well as the scientific discoveries and legacy of the …2023 – Viking 1 Launch: Aug. 20, 1975; Arrival: Jun. 19, 1976 Viking 2 Launch: Sept. 9, 1975; Arrival: Aug. 7, 1976 NASA’s Viking Project found a place in history when it became the first mission to land a spacecraft safely on the surface of another planet. Two identical spacecraft, each consisting of a lander and an orbiter, were built.

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Oct 13, 2023 · Viking Orbiter. The Viking Mars mission was performed by two spacecraft, Viking 1 launched on August 20, 1975, and Viking 2, launched September 9, 1975. Each spacecraft consisted of an orbiter and a lander, which traveled attached together for nearly a year to reach Mars orbit. The orbiters then began …The first spacecraft to successfully land on Mars, Viking 1 was part of a two-part mission to investigate the Red Planet and search for signs of life. Viking 1 consisted of both an orbiter and a lander …NASA's life-hunting Viking mission to Mars was the most complex robotic exploration effort of its day, but the space agency initially wanted it to be even more …Mars Exploration Section Missions. Mars Pathfinder. Mars Pathfinder was launched December 4, 1996 and landed on Mars' Ares Vallis on July 4, 1997. It was designed as a technology demonstration of a new way to deliver an instrumented lander and the first-ever robotic rover to the surface of the red planet. Pathfinder not only …Cruising is a great way to explore the world and experience different cultures. For those looking for a unique and luxurious experience, Viking Cruises offers an unforgettable jour...

Are you looking for a unique and unforgettable vacation experience? Look no further than My Viking Cruise. Offering a wide variety of cruise options, My Viking Cruise is the perfec...On August twentieth nineteen seventy five, a titan centaur launched Viking one into space on a mission to mars. About two weeks later, Viking two followed its path to the red planet. For almost a year, the world waited. Of all the planets in our solar system, Mars and Earth are the most similar.30 July 2001. A claim that NASA overlooked evidence of life on Mars in data collected by the Viking missions 25 years ago has been met with interest and scepticism. Joseph Miller, a visiting ...Mars indeed does have water ice clouds, similar to Earth’s cirrus clouds, both high in the atmosphere and often forming as icy fog just above the ground surface. The Viking orbiter...1 day ago · Mars arrival: September 12, 1997 Contact lost: November 5, 2006. Mars Global Surveyor was the first completely successful Mars orbiter since Viking 1 shut down in 1980. The start of Mars Global Surveyor’s science mission was delayed due to a problem with one of its solar panels that caused its aerobraking period to last …We’ve made it to the moon, but the National Aeronautics and Space Administration (NASA) isn’t stopping there. Over the years, plenty of iconic space-exploration missions have taken...Solar System. Mars. Viking at 40: How NASA Mission Brought Mars Into the Light. News. By Nola Taylor Tillman. published 20 July 2016. The first color image taken …Feb 11, 2021 · The Viking success. The first successful landing on Mars came on July 20, 1976, when NASA's Viking 1 lander touched down in Chryse Planitia (The Plains of Golf). The massive 1,270-lb (576-kilogram ...Aug 19, 2010 · Transcript. Reporter: "On August 20, 1975, the first Viking spaceship was launched. Just two weeks later, there was a second Viking launch. Together they began the search for Martian life." Narrator: Two orbiters, two landers, headed for two different locations on the red planet. It was a gutsy mission. "It was one of the biggest adrenaline ... Jun 1, 1991 · Seemingly, using the evidence of the Viking missions, there is no life on Mars. The results are, however, equivocal. Given that the conditions for life on Mars are marginal at best, a sample size of two is much too small to determine the habitation of the entire planet. The two Viking lander sites are probably not representative of the majority ...Work on China’s Tianwen-3 Mars sample return mission is progressing “relatively smoothly” and will launch around 2030, ... The Viking 1 lander also set down …Sep 30, 2022 · Viking: Directed by Stéphane Lafleur. With Steve Laplante, Larissa Corriveau, Fabiola Nyrva Aladin, Hamza Haq. A behavioral research team observes and attempts to replicate the experiences of the first manned mission to Mars.

Sep 2, 2021 ... The Viking missions set the gold standard for landing on Mars, but they couldn't resolve the big question — are we alone?

The First Viking Mission to Mars. G. A. Soffen and C. W. Snyder Authors Info & Affiliations. Science. 27 Aug 1976. Vol 193, Issue 4255. pp. 759 - 766. DOI: …Jul 15, 1996 · It was obtained by Viking 1 just minutes after the spacecraft landed successfully early on July 20, 1976. Twenty years ago, on July 20, 1976, the Viking 1 lander became the first spacecraft to successfully land on the surface of Mars. Several events this week will examine the legacy and impact of Viking on future international Mars missions …4 days ago · The Viking missions to Mars cost nearly $1.1 billion—but that's not the whole story. ... The Viking missions cost $1.06 billion, which, when adjusted for inflation, remain NASA's most expensive robotic planetary science mission of all time. Of this total, more than half ($610 million) was for lander development, $217 …Jul 20, 2006 ... The National Aeronautics and Space Administration's (NASA) Viking 1 mission to Mars captured the world's imagination 30 years ago when the ...Jul 19, 2016 ... July 20, 1976, 7 years to the day after the Apollo 11 moon landing, the first successful landing on Mars by NASA's Viking spacecraft took ... The Viking mission was planned to continue for 90 days after landing. Each orbiter and lander operated far beyond its design lifetime. Viking Orbiter 1 continued for four years and 1,489 orbits of Mars, concluding its mission August 7, 1980, while Viking Orbiter 2 functioned until July 25, 1978. Because of the variations in available sunlight ... A central purpose of Viking was to search for evidence that life exists on Mars or may have existed in the past. The missions carried three biology experiments the prime purpose of which was to seek for existing microbial life. In addition the results of a number of the other experiments have biological implications: (1) The elemental …Are you looking for a unique way to explore the world? Look no further than My Viking Cruise. With My Viking Cruise, you can experience the world in a whole new way. My Viking Crui...It is programmed to continue working until December 1994. The Viking program is managed for NASA's Office of Space Science by Jet Propulsion Laboratory. 818-354-5011. 1980-0944. Viking engineers at Jet Propulsion Laboratory today sent command to turn off NASA's Viking Orbiter 1 ending the spacecraft's four-year mission in …Aug 20, 2020 · The Viking 1 and 2 landers continued monitoring weather changes at the surface until Nov. 11, 1982, and April 12, 1980, respectively, together returning 4,500 photographs from the two landing sites. The Viking 1 lander held the record for the longest operating spacecraft on the surface of Mars, 2307 Earth days (more …

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Work on China’s Tianwen-3 Mars sample return mission is progressing “relatively smoothly” and will launch around 2030, ... The Viking 1 lander also set down …Mars Exploration Section Missions. Viking 1 & 2. NASA's Viking Project found a place in history when it became the first U.S. mission to land a spacecraft safely on the surface of Mars and return images of the …Are you a die-hard Minnesota Vikings fan who doesn’t want to miss a single game? With the advancements in technology, it has become easier than ever to watch your favorite team liv...Viking 1 was launched Aug. 20. l975, and arrived in Mars orbit June l9, 1976. Viking Lander 1 touched down on the Chryse Plains July 20, 1976. Viking 2 was launched Sept. 9, 1975. It reached Mars Aug. 7, 1976, and Lander 2 dropped to the surface Sept. 3, 1976. The planned lifetime for the spacecraft was 90 days after landing.Mar 18, 2024 · The two "Missions to Mars" spacecraft, Viking I and Viking II, consisted of an orbiter and a landing component. Launched at different times (Viking I was launched in August 1975, and Viking II was launched a month later), each craft took approximately one year to secure itself in Mars's orbit. Identifying a suitable …Both NASA Viking missions used a combination of orbiter and lander to explore Mars in unprecedented detail. This is the first photograph ever taken on the surface of Mars. It …The First Viking Mission to Mars. G. A. Soffen and C. W. Snyder Authors Info & Affiliations. Science. 27 Aug 1976. Vol 193, Issue 4255. pp. 759 - 766. DOI: …Viking Mars. Expand your horizons on our award-winning, all-veranda small ship, with just 930 guests, allowing us to dock where larger ships cannot. Only 930 guests. Length: 745 feet. Beam: 94 feet. Class: small ships. Year built: 2022.Aug 30, 2023 · The Viking missions were monumental in providing scientists with the first high-resolution images of the Martian surface and in-depth analysis of Mars’s meteorological, atmospheric, and surface compositions. The Viking landers were equipped with several instruments to conduct experiments to detect …The Viking missions ended up providing an extremely comprehensive overview of the Martian surface and atmosphere. The Viking orbiters successfully orbited ...Aug 4, 2007 · Overview. Phoenix entered the Martian atmosphere at nearly 13,000 miles per hour (21,000 kilometers per hour) on May 25, 2008, and touched down safely on the surface at 23:38:38 UT in the Green Valley of Vastitas Borealis. It was the first successful landing of a stationary soft-lander on Mars since Viking 2 … ….

Planning for a robotic landing on Mars began at once. By 1966, the basic design of the Viking mission existed under the project name Voyager (later re-used for ...Feb 9, 2010 ... During the dual Viking missions, the two orbiters imaged the entire surface of Mars at a resolution of 150 to 300 meters, and the two landers ...Jan 1, 1998 · The primary goal of the Viking mission, which landed two spacecraft on the surface of Mars during the summer of 1976, was to search for evidence of extant life. On July 20, 1976 Viking larder 1 touched down at Chryse Planitia, and on the opposite side of the planet and at a latitude approximately 1500 miles north of …Oct 27, 2015 ... This video clip from NASA examines space exploration by the Viking missions to Mars and considers if life can exist on the Red Planet.Jul 19, 2016 ... July 20, 1976, 7 years to the day after the Apollo 11 moon landing, the first successful landing on Mars by NASA's Viking spacecraft took ...The Viking mission was: “To increase significantly man’s knowledge of the planet Mars through orbital observations by the orbiter as well as by direct measurements made by the Lander during Martian atmospheric entry, descent, and landing. ... Viking 1 entered Mars orbit on June 19, 1976 and began taking pictures of possible landing sites ...The Viking Orbiter: and lander: Viking 1 was launched on August 20, 1975 and arrives at Mars on June 19, 1976. The Lander was released from the orbiter and landed on July 20, 1976. The mission of the orbiter ended on August 7, 1980 and the lander's mission ended on February 1, 1983. The Viking 1 lander operated out of …Mission: Go to PIAxxxxx: Refine this list of images by: Spacecraft: Instrument: Click on an image for detailed information ... Viking 2 Image of Mars Utopian Plain Full Resolution: TIFF (18.8 MB) JPEG (556.8 kB) 2000-11-04: Mars: Viking: 1124x1040x3: PIA02982: Color Mosaic of Olympus Mons Full ...Feb 20, 2024 · Mission to Mars. The 15-cent Viking Missions To Mars stamp was issued July 20, 1978. This is the proof test article of the Viking Mars Lander. While Viking 1 and 2 were on Mars, this third vehicle was used on Earth to simulate their behavior and to test their responses to radio commands. Earlier, it had been used …Jul 19, 2016 ... July 20, 1976, 7 years to the day after the Apollo 11 moon landing, the first successful landing on Mars by NASA's Viking spacecraft took ... Mars viking mission, Three different types of biochemical experiments on samples of Martian surface material (‘soil’) were conducted during the Viking mission to Mars. In the carbon assimilation or pyrolytic release (PR) experiment, 14 CO 2 and 14 CO were exposed to soil in the presence of light. A small amount of gas was found to be fixed by soil (interpreted ..., Mar 31, 2023 · Viking is the name of two missions launched by NASA in 1975 to explore Mars.Each mission consisted of an orbiter and a landing probe. The two missions were successfully inserted in orbit around Mars and the surface probes landed successfully., Sep 26, 2023 · Temperatures on Mars can range from -284 degrees F to 86 degrees F. The atmosphere on Mars is 96% carbon dioxide. One day on Mars lasts about 37 minutes longer than an Earth day. A year on Mars is almost twice as long as a year on Earth. Gravity on Mars is about one-third of the gravity on Earth., Aug 4, 2007 · Overview. Phoenix entered the Martian atmosphere at nearly 13,000 miles per hour (21,000 kilometers per hour) on May 25, 2008, and touched down safely on the surface at 23:38:38 UT in the Green Valley of Vastitas Borealis. It was the first successful landing of a stationary soft-lander on Mars since Viking 2 …, Highlights. Viking 1 and 2 were a pair of NASA Mars landers and orbiters that launched in 1975 and arrived in 1976. The orbiters created global maps while the landers examined the surface up close. The landers performed …, The 2022-built MS Viking Mars cruise ship is the 8th in a 10-unit series of identical vessels built for Viking Ocean Cruises.Viking OCEAN's current plans are for a fleet of 16 sisterships, all of …, Feb 20, 2024 · Mission to Mars. The 15-cent Viking Missions To Mars stamp was issued July 20, 1978. This is the proof test article of the Viking Mars Lander. While Viking 1 and 2 were on Mars, this third vehicle was used on Earth to simulate their behavior and to test their responses to radio commands. Earlier, it had been used …, Risk has been described as having two components: (i) the likelihood that a given hazard will occur, and (ii) the severity of the consequences if the hazard does occur [9]. A risk assessment aims ..., Are you a die-hard Minnesota Vikings fan who doesn’t want to miss a single game? With the advancements in technology, it has become easier than ever to watch your favorite team liv..., Jan 7, 2020 · Facts About The Viking 1 Orbiter/Lander Mission! Viking 1 composed of an orbiter and lander which both orbited Mars while a target landing zone was selected.; The Viking orbiters were based on the Mariner spacecraft design.; Both Viking orbiters were powered by large solar panels.These provided 620 W of power for their camera’s and …, Apr 2, 2019 · Viking launched in 1975 and landed on Mars in 1976. What was that like? I went out to [the Jet Propulsion Laboratory (JPL) in] California for the landing and half expected it to crash., The Viking mission was: “To increase significantly man’s knowledge of the planet Mars through orbital observations by the orbiter as well as by direct measurements made by the Lander during Martian atmospheric entry, descent, and landing. ... Viking 1 entered Mars orbit on June 19, 1976 and began taking pictures of possible landing sites ..., The Mars 2020 mission Perseverance rover is the first step of a roundtrip journey to return Mars samples to Earth. (2020-present) Read More. ... The second of twin probes conducting experiments to look for signs of life on Mars, Viking 2 analyzed a second site during its mission until its power source ran out. (1975-1980), Viking mission to Mars. Catalog codes: Mi:DM BL38, Sn:DM 501a, Yt:DM BF38, Sg:DM MS541 Themes: Outer Space Issued on: 1976-09-20 Size: 103 x 78 mm Colors: Multicolor Designers: PAD Studios Printers: Format International Security Printers Ltd. Format: Souvenir Sheet Emission: Commemorative, NASA's Viking Mission to Mars was composed of two spacecraft, Viking 1 and Viking 2, each consisting of an orbiter and a lander. The primary mission objectives were to obtain high resolution images of the Martian surface, characterize the structure and composition of the atmosphere and surface, and search for evidence of life., Jul 20, 2006 ... The National Aeronautics and Space Administration's (NASA) Viking 1 mission to Mars captured the world's imagination 30 years ago when the ..., Sep 13, 2010 · Viking 2 landed in September 1976 and lasted through 1980. Samples ofMars dirt collected by NASA's Viking Mars landers back in the 1970s may have containedcarbon-based chemical building blocks of ..., published 20 July 2016. The first image captured by NASA's Viking 1 lander on Mars, on July 20, 1976, shows one of the spacecraft's footpads.(Image credit: NASA/JPL) …, Jun 30, 2016 ... Interestingly, Viking wasn't the first Mars lander. The Soviet Union had sent Mars 2 and 3 to the planet in 1971. Both stopping working early, ..., Nov 17, 2023 · The team of scientists selected by NASA, in 1969, to plan and conduct the biological investigation on the Viking spaoecraft consisted of the 'authors and the late Dr Wolf Vishniac (University of ..., The Viking missions ended up providing an extremely comprehensive overview of the Martian surface and atmosphere. The Viking orbiters successfully orbited ..., Jan 31, 2023 · Findings from various Martian missions Viking mission. The main goal of the Viking mission was to look for signs of current or past life on Mars (Biemann et al., 1977; Mazur et al., 1978). Viking found clear evidence of the presence of water vapour and water ice, as well as strong inferences that there was once a significant amount of ..., The Viking Mars Mission. By The Viking Mars Missions Education and Preservation Project. Dedicated to the men and women of Viking and their families. Viking was the first successful landed Mars ..., Viking Update. Jan. 26, 1977. NASA's Mars Exploration Program includes two active rovers and three active orbiters. Concept studies have begun for a potential future Mars orbiter mission. › Full image and caption. Credit: NASA/JPL/USGS. Viking project officials have completed the first in series of three maneuvers with Viking Orbiter to fly ... , Jan 1, 2023 · Nasa Viking Mission मंगल ग्रह पर नासा का वाइकिंग मिशन | Viking Mission Life Discovery on Mars 1976 तक वैज्ञानिको को मंगल ग्रह के Surface , Soil Composition और Geography के बारे में बेहद ही कम जानकारी मौजूद थी हमें तब ..., NASA’s Viking Project was the culmination of a series of missions to explore Mars that had begun in 1964 with Mariner 4, and continued with the Mariner 6 and 7 flybys in 1969, and the Mariner 9 orbital mission in 1971 and 1972. Viking found a place in history when it became the first Amer-. August 7, 1976. After studying orbiter photos, the ... , Viking 2 will orbit Mars on August 7 with the landing scheduled for September 4. The Viking mission is conducted by the Langley Research Center, Hampton, VA. JPL is responsible for the Orbiter spacecraft and tracking and communications. Martin Marietta, Denver, Colorado, is responsible to Langley for the Lander. 818-354-5011. , 30 July 2001. A claim that NASA overlooked evidence of life on Mars in data collected by the Viking missions 25 years ago has been met with interest and scepticism. Joseph Miller, a visiting ..., Aug 6, 2020 · The Viking Spacecraft The Viking Mission to Mars thus combined two major goals: to study the atmosphere and geology of the entire planet, and to analyze its soil and search for life in two specific locations. Each of the two Vikings launched toward Mars in 1975 was a double spaceship. One part, the Orbiter, would circle …, Jul 19, 2006 · Narrator: After Mars Observer, NASA picked up and launched two hugely successful new missions - the orbiting Mars Global Surveyor, and Mars Pathfinder, which landed July 4th 1997. Its rover, Sojourner, was a predecessor of the current rovers, Spirit and Opportunity, which are still working after two-and-a half years., Viking lander biological experiments. In 1976 two identical Viking program landers each carried four types of biological experiments to the surface of Mars. The first successful Mars landers, Viking 1 and Viking 2, then carried out experiments to look for biosignatures of microbial life on Mars. The landers each used a robotic arm to pick up ... , 4 days ago · The Viking missions to Mars cost nearly $1.1 billion—but that's not the whole story. ... The Viking missions cost $1.06 billion, which, when adjusted for inflation, remain NASA's most expensive robotic planetary science mission of all time. Of this total, more than half ($610 million) was for lander development, $217 …, Jul 19, 2006 · Narrator: After Mars Observer, NASA picked up and launched two hugely successful new missions - the orbiting Mars Global Surveyor, and Mars Pathfinder, which landed July 4th 1997. Its rover, Sojourner, was a predecessor of the current rovers, Spirit and Opportunity, which are still working after two-and-a half years.