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The NASA spacecraft MAVEN entered into orbit around Mars to study the planet's atmosphere.
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NASA
American space and aeronautics agency
The National Aeronautics and Space Administration is an independent agency of the US federal government responsible for the United States's civil space program, aeronautics research and space research. Established in 1958, it succeeded the National Advisory Committee for…Source: Wikipedia (CC BY-SA)
MAVEN
NASA Mars orbiter (2013–Present)
MAVEN is a NASA spacecraft orbiting Mars to study the loss of that planet's atmospheric gases to space, providing insight into the history of the planet's climate and water. The name is an acronym for "Mars Atmosphere and Volatile Evolution" while the word maven also denotes "a…Source: Wikipedia (CC BY-SA)
Mars
Fourth planet from the Sun
Mars is the fourth planet from the Sun. It is also known as the "Red Planet", because of its orange-red appearance. Mars is a desert-like rocky planet with a tenuous carbon dioxide atmosphere. At the average surface level the atmospheric pressure is a few thousandths of Earth's,…Source: Wikipedia (CC BY-SA)
Atmosphere of Mars
Gas layer surrounding Mars
The atmosphere of Mars is the layer of gases surrounding Mars. It is primarily composed of carbon dioxide (95%), molecular nitrogen (2.85%), and argon (2%). It also contains trace levels of water vapor, oxygen, carbon monoxide, hydrogen, and noble gases. The atmosphere of Mars…Source: Wikipedia (CC BY-SA)