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On July 15, 1965, Mariner 4 transmitted this image of the Martian surface from 7,829 miles away. The photograph shows a 94-mile diameter crater. Although originally not expected to survive much past the Mars flyby encounter, Mariner 4 lasts about three years in solar orbit, continuing long-term studies of the solar wind environment and making. Mariner 4 Mariner 4 One of the great successes of the early American space program, the Mariner 4 mission journeyed to Mars -- making its closest approach on July 15, 1965 -- and took the first photos of another planet from space Mariner 4 war die erste Raumsonde, die Bilder vom Mars machte und zur Erde schickte. Es war ein Meilenstein in der Geschichte der Raumfahrt: Am 15. Juli 1965 erreichte Mariner 4 den Mars Mariner 4. Spacecraft Specifications Mariner 4 images . Detailed Information on the Spacecraft, Experiments, and Data Sets. Introduction. Mariner 4 was the first spacecraft to obtain and transmit close range images of Mars. After its launch on November 28, 1964 and a journey of hundreds of millions of kilometers, Mariner 4 passed within 9844 kilometers of Mars on July 14, 1965. Beginning at a. Mariner 4 (together with Mariner 3 known as Mariner-Mars 1964) was the fourth in a series of spacecraft intended for planetary exploration in a flyby mode. It was designed to conduct closeup scientific observations of Mars and to transmit these observations to Earth.Launched on November 28, 1964, Mariner 4 performed the first successful flyby of the planet Mars, returning the first close-up.

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The Mariner 4 mission, the second of two Mars flyby attempts launched in 1964 by NASA, was one of the great early successes of the agency, and indeed the Space Age, returning the very first photos of another planet from deep space. Using a new all-metal shroud, the spacecraft lifted off without any problems and was successfully boosted towards Mars by the Agena D upper stage. A single course. Blast from the past: Mariner 4's images of Mars. I was searching around for some images to use for a public talk and stumbled across some work that had been posted at unmannedspaceflight.com several years ago: a couple of different amateur takes on the Mariner 4 image catalog, the first set of photos returned from Mars, dating to July 14, 1965 Mariner 3 und 4 hatten als Ziel den Vorbeiflug am Mars. Die etwas leistungs­fähigere Atlas Agena D erlaubte es, eine 260,8 kg schwere Sonde auf den Weg zu bringen. Davon entfielen 15,8 kg auf die Experimente. Die Spannweite der Sonden betrug 6,88 m und die Höhe 2,89 m

Mariner 4 war die erste Sonde, die den Mars besuchte. Sie startete 1964 und flog am 15. Juli 1965 in knapp 10000 km Abstand am Mars vorbei. Dabei machte sie 22 Fotos, die etwa 1% der Oberfläche des Mars zeigten. Mariner 6 kam 1969 mit ca. 3500 km Abstand schon um einiges näher an Mars heran und konnte deutlich bessere Fotos machen (auch die Aufnahmetechnik hatte sich in der Zwischenzeit. Mariner 4: 28. November 1964, 14:22:01 NASA (USA) Flog am 15. Juli 1965 in 9.846 km Entfernung planmäßig am Mars vorbei. Lieferte erste Nahaufnahmen vom Mars, insgesamt 22 Fotos. 8. Zond 2: 30. November 1964, 13:12 Sowjetunion: Geplanter Vorbeiflug am Mars. Der Kontakt brach am 2. April 1965 wegen eines fehlerhaften Solarpanels ab. Flog am 6. Mariner 3 and 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 Mariner 3 did not get to Mars. Three weeks later, on November 28, 1964, Mariner 4 was launched successfully on an eight-month voyage to the red planet. The spacecraft flew past. Von höherem Leben keine Spur. Mariner 4 bleibt drei Jahre funktionsfähig und wird in dieser Zeit für Untersuchungen des Sonnenwindes genutzt. Die Sowjet-Sonde Zond 2 fliegt zwar am Mars vorbei, der Funkkontakt geht jedoch verloren. 1969. Die NASA schickt Mariner 6 und Mariner 7 zum Mars. Sie liefern zusammen rund 200 Fotos von unserem. Mariner 4 - 21 Photos, and a Big First. Decades before Spirit and Opportunity were launched, a probe named Mariner 4 lifted off from Cape Canaveral, Fla. On July 14, 1965, it reached the planet Mars and took the first photos humans had ever seen of another world: 21 grainy black and white images, sent back through the distances of space

Mariner 4 was the first spacecraft to fly by Mars and send home close-up images. Find out how the mission changed the way we explore the Red Planet On July 14, 1965, the American space probe Mariner 4 flew by Mars, sending back photographs of the planet.You can license this story through AP Archive: http.. Mariner 4 (indicata in letteratura anche come Mariner-Mars 1964 e come Mariner C nella fase di sviluppo) è stata una sonda spaziale statunitense dedicata all'esplorazione di Marte, la prima a raggiungere con successo il pianeta nel 1965.. Gemella del Mariner 3, venne lanciata il 28 novembre 1964 e raccolse le prime immagini ravvicinate della superficie marziana (22 in tutto) durante il.

Mariner 4 Image of Mars NAS

  1. Mariner 4 defined and pioneered the systems and technologies needed for a truly interplanetary spacecraft, says Rob Manning (BS '81), JPL's chief engineer for the Low-Density Supersonic Decelerator and formerly chief engineer for the Mars Science Laboratory. All U.S. interplanetary missions that have followed were directly derived from the architecture and innovations that engineers behind.
  2. utes later. Mariner 4 had successfully completed the first close encounter with the Red Planet
  3. Importantly, Mariner 4 identified geological signs that water may have once flowed on the planet's surface, information that would shape all Mars missions that followed. Images from the Mariner missions also helped astrobiologists find similar landscapes on Earth where they could test equipment for future missions and study the potential for life in Mars-like conditions

Mariner 4 - Mars Missions - NASA Jet Propulsion Laborator

Die erste Nahaufnahme des Mars zeigt ein Gebiet von 330 x 1200 Kilometern Fläche nahe der Ebenen Elysium Planitia im Westen und Arcadia Planitia im Osten. Mariner 4 flog am 14. Juli 1965 in. Mariner 4 was launched on November 28, 1964 and journeyed 228 days to the Red Planet, providing the first close-range images of Mars. The spacecraft carried a television camera and six other science instruments to study the Martian atmosphere and surface. The 22 photographs taken revealed the existence of lunar type craters upon a desert-like.

Mariner 4, NASA-ina svemirska letjelica namijenjena istraživanju Marsa, četvrta iz programa Mariner.Lansirana je 28. studenog 1964. pomoću rakete Atlas-Agena D iz Cape Canaverala.Kraj Marsa je preletio 14. /15.srpnja 1965. i pritom na Zemlju poslao prve fotorgafije njegove površine. Prve fotografije pokazale su Mars kao beživotan planet pun kratera, s niskim atmosferskim tlakom i bez. Low Prices on Mariner 4 July 15, 1965. With a range of 13,600 km and a sun angle of 29 degrees from zenith, this Mariner 4 image was the first picture showing defined craters on the surface of Mars. The area, 163 x 193 (262 x 310 km), is a heavily cratered region south of Amazonis Planitia Mariner 4 studies Martian surface. The unmanned spacecraft Mariner 4 passes over Mars at an altitude of 6,000 feet and sends back to Earth the first close-up images of the red planet. Launched in. Mariner 4: Our First Up-Close Look At Mars. In the grand scheme of things, it wasn't all that long ago that the entire body of knowledge of our solar system was built solely with Earth-based.

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Fünfzig Jahre Mariner 4: Die ersten Bilder vom Mars BR

July 14, 1965: Mariner 4 Brings Mars Up Close and Cardinal

Mariner 4. Mariner Crater, as seen by Mariner 4 in 1965. Pictures like this suggested that Mars is too dry for any kind of life. Streamlined Islands seen by Viking orbiter showed that large floods occurred on Mars. The image is located in Lunae Palus quadrangle. Mariner 4 probe performed the first successful flyby of the planet Mars, returning the first pictures of the Martian surface in 1965. Mars flyby: July 14, 1965. Mariner 4 was the first spacecraft to fly by Mars and obtain close-up pictures of the Red Planet, passing within 9,844 kilometers (6,117 miles) of Mars. It then took four days to transmit the data back to Earth. Mariner 4 imaged a large, ancient crater on Mars and confirmed the existence of a thin Martian atmosphere composed largely of carbon dioxide. Once past Mars. MARS Mariner 4 Frame quantity. Add to cart $ 2,960.00. Description Additional information MARINER 4. The main design goal is to maintain the characteristics of the all-round model. This means finding an excellent balance between rigidity, light weight and aerodynamics to create the unique riding experience of Mariner 4. Equally synonymous with sensitivity and precision, creating the. When Mariner 4 passed behind Mars, the radio signal ceased and was reacquired when the spacecraft reappeared. The transmission of the tapes started about 8 hours after signal reacquisition and continued until August 3. Mariner 4 successfully transmitted data from launch until October 1, 1965, when a temporary loss of communication with the spacecraft occurred until 1967. Mariner 4 space probe.

MAVEN Continues Mars Exploration Begun 50 Years Ago by

Mariner 4. 28.11.1964 Amerika Nach Misserfolg von Mariner 3 erste erfolgreiche Marsmission. Die Sonde fliegt am Mars vorbei und sendet 22 Fotos von dem Planeten, die, untypisch für den gesamten. Die Hawaiian Mars musste bei den jüngsten Vorführungen über Oshkosh nach Triebwerksproblemen an Motor 4 einen Flug abbrechen und in einem für sie zu flachen See notwassern Mariner 3's twin, Mariner 4, reached Mars on July 14, 1965, after 228 days of travel, and made its closest approach to the planet the next day. It was able to capture 21 black and white images of the Martian surface — the first pictures taken of another planet from space. Several of the images from the Mariner 4 mission to Mars can be seen here. Scientific instruments on the 574-pound.

Mariner IV was the fourth in a series of spacecraft used for planetary exploration in a flyby mode and the first spacecraft to succesfully image a planet. It was launched on 28 November 1964 by an Atlas/Agena rocket and flew by Mars on July 15, 1965 Briefmarke: Mariner 4 (Ungarn) (Exploration of Mars) Mi:HU 2933A,Sn:HU 2275,Yt:HU 2359,Sg:HU 2869,AFA:HU 2870,Un:HU 2933A,PHu:HU 2943. Kaufen, verkaufen und tauschen Sie Sammelstücke leicht mithilfe der Colnect Sammlergemeinschaft. Nur Colnect gleicht automatisch Sammelstücke, die Sie suchen, mit Sammelstücken, die Sammler zum Verkauf oder Tausch anbieten, ab. Colnect revolutioniert Ihr.

The Mariner Mars Missions - NAS

Mariner 4 image showing at least twenty craters of various sizes on Mars, resembling the lunar surface. The image was taken from 13,000 km and measures 253 by 225 km. The area is in western Memnonia Fossae, centered at 24 S, 169 W. The sun angle is 39 deg. from zenith, allowing some detail to be seen, including a central peak in the crater right of the center. North is at 11:30. (Mariner 4. Mariner 4 was launched November 28, 1964, and reached Mars on July 14, 1965. Mariner 4 returned 22 pictures of the Martian surface. The spacecraft's closest approach was at 9912 kilometers. Mariner 6 and 7, both launched in 1969, completed the first successful dual mission to Mars (Mariner 5 was sent to Venus). Mariner 6 and 7 were identical spacecraft sent to flyby Mars in order to collect. Observations taken by Mariner 4, Mars 2, Mars 3, Mars 5, and Phobos 2 are used to model the shape, position, and variability of the Martian bow shock for the purpose of better understanding the interaction of this planet with the solar wind. Emphasis is placed upon comparisons with the results of similar analyses at Venus, the only planet known to have no significant intrinsic magnetic field.

The Mariner 4 spacecraft began its historic journey to the planet Mars on November 28, 1964. On July 15, 1965, it sent the first pictures back to the let Propulsion Laboratory at Pasadena. Lyndon B. Johnson, Remarks Upon Viewing New Mariner 4 Pictures From Mars. Online by Gerhard Peters and John T. Woolley, The American Presidency Project https. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators. Observations taken by Mariner 4, Mars 2, Mars 3, Mars 5, and Phobos 2 are used to model the shape, position, and variability of the Martian bow shock for the purpose of better understanding the interaction of this planet with the solar wind. Emphasis is placed upon comparisons with the results of similar analyses at Venus, the only planet known to have no significant intrinsic magnetic field Mariner 4 was the fourth in a series of spacecraft used for planetary exploration in a flyby mode. It was designed to conduct closeup scientific observations of the planet Mars and to transmit these observations to Earth. Mariner 4 gave scientists their first glimpse of Mars at close range, passing over the planet at an altitude of 9,846 kilometers (6,118 miles) above the surface and putting. Mariner 4 necesitaba 170W para operar. Una batería recargable de zinc/plata con capacidad de 1200 W fue usado para reservar energía durante la oscuridad. La propulsión usaba hidracina, 4 motores de 222-N en un motor estaba montado en uno de los lados de la estructura octogonal. El control de actitud fue controlada por 12 motores de nitrógeno frío montados en los extremos de los paneles.

Mariner 4 - Wikipedi

Mars: Mariner Mars 1971 (Mariner 9) 5484x4461x1: PIA02995: Nix Olympica Identified by Mariner 9 on Mars Approach Full Resolution: TIFF (9.878 MB) JPEG (1.116 MB) 2000-11-04: Mars: Mariner Mars 1964 (Mariner 4) 600x550x1: PIA02979 NASA's Mariner 4 rocket preparing for launch (0:19). Two engineers. The launch of a Mariner rocket. Opening titles, The Story of A Scientific Search Told by Don Herbert (0:27). A blurry photo of Mars, as seen through a telescope (1:01). Our host introduces himself, with a corkboard holding the photo (1:34). Robert Leighton of the California Institute of Technology speaks with. La sonde Mariner 4 était constituée d'un châssis en forme de prisme octogonal. 4 panneaux solaires de 176 x 90 cm, prolongés par des pales solaires étaient fixés au sommet du châssis, conférant au véhicule une envergure de 6,88 m. Les 28224 cellules photovoltaïques des panneaux solaires fournissaient 700 W au niveau de la Terre et 310 W au niveau de Mars. Un accumulateur électrique. Påhængsmotorer 4-takt Mariner. Uanset om du tager en afslappet weekend på havet, drøner hen over det flade vand foran konkurrenterne eller fisker langt fra land, så er Mariner din pålidelige og kraftfulde følgesvend. Vi har et stort udvalg fra den 2,5 HK 4-takt til den velkendte 6-cylindrede 350 HK Verado. Luk. Læs mere Launched on November 28, 1964, the Mariner 4 probe arrived at Mars later that summer. Its closest approach was just 9,846 kilometers from the planet at 6:01 P.M PDT on July 15, 1965

In Depth Mariner 04 - NASA Solar System Exploratio

Mariner 3 and 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 Mariner 3 did not get to Mars. Three weeks later, on November 28, 1964, Mariner 4 was launched successfully on an eight-month voyage to the red planet Mariner 4 was released towards Mars on November 28, 1964, and was a first successful mission to Mars. It was the first to return the pictures of the surface of the planet Mars. Mariner 4 also captured the image of another planet which transformed the scientific view of the existence of life in Mars. Mariner 4 spacecraft was made up of octagonal magnesium frame, solar panels mounted on the top. 1965: After a few million years of watching Mars from afar, humanity meets the red planet — not quite in person, but through the eyes of NASA's Mariner 4 satellite. The half-ton space camera.

When Mariner 4 launched for Mars in 1964, it marked the first time mankind had successfully sent a probe to the red planet. It radioed back Mars surface images at a resolution of 2 miles across. Fifteen missions later, we now have vehicles roving the Martian landscape drilling holes for soil samples, crunching rocks, sniffing the air and determining chemical compositions of the. Mariner 1: Attempted Venus flyby, 1962, destroyed shortly after launch when vehicle veered off course.; Mariner 2: Venus flyby, 1962.; Mariner 2 history: Mariner-Venus 1962 Final Project Report (NASA SP-59, 1965) Mariner 3: Attempted Mars flyby, 1964, transmissions ceased 9 hours after launch, spacecraft entered solar orbit.; Mariner 4: Mars flyby, 1964-1965 Nov 13, 2014 - Mariner 4 was the fourth in a series of spacecraft used for planetary exploration in a flyby mode and represented the first successful flyby of the planet Mars, returning the first pictures of the martian surface. These represented the first images of another planet ever returned from deep space. Mariner 4 was designed to conduct closeup scientific observations of Mars and to. Mariner 3 (zusammen mit Mariner 4 bekannt als Mariner-Mars 1964) war eine von zwei identischen Deep-Space-Sonden, die von der Jet Propulsion Laboratory (JPL) für NASAs Mariner-Mars 1964-Projekt, das wissenschaftliche Beobachtungen des Planeten Mars aus nächster Nähe (Vorbeiflug) durchführen und Informationen über den interplanetaren Raum und den Raum um den Mars übertragen sollte. The historic Mariner 4 mission returned the first photos ever taken of another planet from deep space. The craft, launched from Cape Canaveral Air Force Station, performed a flyby of Mars, making.

The spacecraft was built as a backup for the Mariner 4 Mars probe. After the success of Mariner 4, the Mariner 5 spacecraft was reconfigured for a Venus flyby. Mariner 5 experiments included an interplanetary ion plasma probe, a trapped radiation detector, a triaxial low field helium magnetometer, an ultraviolet photometer, a two-frequency beacon receiver experiment, an S-band occultation. RUMÄNIEN 1967 EINZELWERT Weltraumforschung Mars Mariner 4 postfrisch - EUR 1,00. FOR SALE! siehe Bild: what you see, is what you get Bitte beachten Sie 22414507961 The Mariner Mars 71 mission was planned to consist of two spacecraft on complementary missions, but due to the failure of Mariner 8 to launch properly, only one spacecraft was available. Mariner 9 combined mission objectives of both Mariner 8 (mapping 70 % of the Martian surface) and Mariner 9 (a study of temporal changes in the Martian atmosphere and on the Martian surface). For the survey. Mars is the fourth planet from Sol and the second smallest planet in the Sol system. It has a population of ten billion humans, and is governed by the Martian Congressional Republic. Originally a colony of Earth settlers, about three generations after the first colonists dug into the rock and soil, making Mars humanity's second home, the colonists began to get restless. While dependent on. After the failure of Mariner 3 (whose camera shroud had jammed), NASA scientists and engineers at the Jet Propulsion Laboratory anxiously awaited the signals from Mariner 4's cameras during the final approach to Mars. There had been some anomalous errors pointing towards the tape recorder (seen below), and they had a right to be nervous as the tape recorder on Mariner 4 was a spare not.

Blast from the past: Mariner 4's images of Mars - Planetar

Read Mariner 4: Mission to Mars, The Physics Teacher on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips Mariner Mars 1971 aangepast. De Mariner Mars missie 1971 bestond uit twee onbemande ruimteschepen. Mariner 8 moest 70% van het Deze foto's dienden als overbrugging tussen de vage foto's van Mariner 4, 6 en 7 en close-ups van Mariner 9. Naarstig zocht het team naar herkenbare details. Ten slotte viel op, dat de positie van een donkere stip overeenkwam met de locatie van Olympus Mons. Uit. Mars Notes. Mars is a small planet, cold, and as far as we know, lifeless. However, it is the most hospitable planet in the Solar System, second only to Earth. The first spacecraft to visit Mars was Mariner 4, this happened in 1965. Mars has ice caps at both poles made up of solid carbon dioxide or dry ice

Mariner - Wikipedi

When the MAVEN spacecraft arrived at the Red Planet on Sept. 21, it marked the continuation of exploration of one of Earth's nearest celestial neighbors that began 50 years ago. In 1964, the Mariner 4 probe became the first to successfully fly by Mars, opening the way for future human exploration. MAVEN was launched from the Kennedy Space Center atop an Atlas V rocket on Nov. 18, 2013. Mariner 4 (US) Launch date 28 November 1964. Mars flyby 14 and 15 July 1965. After a series of failures by both the Soviet Union and the United States, the first successful Mars flyby was made by Mariner 4. It sent back 21 black and white photos of a largely cratered surface. Closest approach was at a distance of 9846 km from the surface, on 15 July. Zond 2 (USSR) Launch date 30 November 1964. NASA. Four years before the Apollo 11 Moon landing, the Mariner 4 spacecraft flew past Mars and took the first photo of another planet from space. In 1965, this grainy black-and-white photo was is. Mariner 4 Nearing Mars. July 6, 1965. Credit... The New York Times Archives. See the article in its original context from. July 6, 1965, Section food fashions family furnishings, Page 30 Buy Reprints After Mariner 4 made a fly-by in 1965 and the landing of the Viking landers in 1977, it was discovered that Mars was a barren, lifeless rock. Further robotic missions were launched, many of which failed to reach the planet for many reasons, giving rise to the notion of the Mars Curse. Liquid water was finally discovered on the planet in 2015, but it would take until the 2070s for humans to.

Mars Missionen - Astrokramkist

February/March 1969 - Mariner 6 and Mariner 7 Launched | NASA

Chronologie der Marsmissionen - Wikipedi

The Mariner 4 spacecraft was the first to bring us close up pictures of Mars in 1965. Since then several space probes have visited Mars. The Viking 1, Viking 2, and Pathfinder landers, landed on the surface of Mars and sent us back pictures of the surface. They also analyzed the Martian soil. Mars will likely be the first planet that a human will step foot on The first spacecraft from Earth to visit Mars was Mariner 4 in 1965. Since then, several robotic spacecraft have flown by, orbited, or landed on Mars and sent back lots of information about this world so different from our own. Mars is a cold, bleak wasteland, with very thin air that we Earthlings could never breathe. However, many of the pictures our telescopes, orbiters, and rovers have sent. Die NASA-Sonde Mariner 10 passierte heute vor genau 40 Jahren als erstes menschengemachtes Raumfahrzeug den Merkur. Dabei und bei späteren Annäherungen machte sie auch Tausende Fotos von der. 50 Years Since Mariner 4 Encountered Mars. Presenter: Jim Zimbelman July 15, 2015 | 12 - 12:15pm National Air and Space Museum in Washington, DC. Free. Meet at the Museum Great Seal, in the Boeing Milestones of Flight Hall on the first floor. About the Ask an Expert. Martin Mariner, Mars, & Marlin Flying Boats v2.1.0 / 01 aug 21 / greg goebel * During World War II, the Glenn L. Martin company developed two flying boats, the Mariner and the giant Mars, and after the war the company would develop the last large flying boat in US service, the Marlin

Mars’ Two-Faces and Moons Could Result from an EarlyRed Planet Mars - Wander Lord

Analysis of the Mariner 4 photography of Mars. Cambridge, Mass. : Smithsonian Institution Astrophysical Observatory, 1968. (OCoLC)742271554. Document Type: Book. All Authors / Contributors: Clark R Chapman; James B Pollack; Carl Sagan; Smithsonian Astrophysical Observatory. Find more information about: Clark R Chapman James B Pollack Carl Sagan JPL - Mariner 4 first image of Mars. Catalog Number 102712255. Type Still Image. Description Black and white. First Mariner 4 images from Mars. Publisher JPL Identifying Numbers. Other number: P3075: Verso pencil: Dimensions overall: 8 x 10 Category Digital Image Credit Courtesy of Gwen Bell. Since Mariner 4's arrival in 1965, a fleet of robotic spacecraft and rovers has landed on and orbited Mars. Collectively, they have dramatically increased the knowledge-base about the Red Planet. Mariner 4 (1965) The Mariner 4 was the very first spacecraft to actually go to Mars when it performed a flyby in 1965. What's even more impressive is that the Mariner 4 gave us the first pictures of Mars (photo below), and is the first craft that gave us pictures of a planet in deep space. Communication with Mariner 4 ceased in 1967, 2 years after its launch. It was hit by numerous. Robotic missions to Mars. In the 20th century, the humanity began exploration of the Red Planet with robotic probes.Although they were often viewed as only precursors to human missions, the cost and complexity of the expedition to Mars left automatic orbiters and landers as the only alternative for the exploration of the planet as late as early decades of the 21st century A photograph of craters on Mars taken by Mariner 4 in 1965 . The first clear image transmitted from the surface of Mars by Viking 1 in 1976 . Perhaps this very lifelessness has made Mars that much more appealing to would-be colonizers. With no living creatures to be subjugated, moral questions about taking over an entire world seem less fraught than if living, breathing Martians existed.