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Viking 1 on Mars Ozone depletion Artwork depicting the Cassini orbiter, centre, after having released the Huygens probe, left, toward Saturn's moon Titan. The planet itself appears at back. The Huygens probe landed on Titan on Jan. 14, 2005, becoming the first craft to land on a solid body in the outer solar system. The Cassini craft began orbiting Saturn on June 30, 2004, returning a wealth of data and images about the planet, its rings, and its moons during a multiyear study.
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Viking 1 on Mars
Viking 1's sample scoop, poised to extract material from the surface of Mars.
NASA
Ozone depletion
Antarctic ozone hole, September 17, 2001.
NASA/Goddard Space Flight Center
Artwork depicting the Cassini orbiter, centre, after having released the Huygens...
NASA/JPL