Artist's Impression of Planck Spacecraft
Artist's impression of the European Space Agency's Planck spacecraft. Planck's main goal is to study the Cosmic Microwave Background — the relic radiation left over from the Big Bang.
Progress of China's Chang'e 2 Moon Probe
This graphic from the China Lunar Exploration Program shows the progress of China's Chang'e 2 moon probe from its lunar orbit out to the L2 Lagrange point 1.5 million km from Earth.
Deep Impact's Comet Tempel 1 Visit
NASA's Deep Impact probe gave scientists their first close-up look at the interior of a comet when it hit. Here, an artist illustrates the 2005 encounter.
Europe's Mars Express Probe
An artist's conception of the European Space Agency's Mars Express craft.
Mars Odyssey Spacecraft at Mars
NASA's Mars Odyssey spacecraft passes above Mars' south pole in this artist's concept illustration. The spacecraft has been orbiting Mars since October 24, 2001. The spacecraft serves as a vital relay for NASA's Mars rover Curiosity. [Related: Mars Rover Curiosity Landing Coverage]
NASA's Mars Reconnaissance Orbiter
NASA's Mars Reconnaissance Orbiter passes over the Red Planet's south polar region in this artist's concept illustration.
NASA's Mars Rover Curiosity
During its 84th and 85th days (sols) on Mars in late 2012, NASA's huge Mars rover Curiosity snapped this newest mosaic self-portrait.
Opportunity Rover Studies Martian Rock
NASA's Opportunity Mars rover used its front hazard-avoidance camera to take this picture showing the rover's arm extended toward a light-toned rock named Tisdale 2 on Aug. 23, 2011.
Dawn Probe Leaves Protoplanet Vesta
NASA's Dawn spacecraft arrived at the giant asteroid Vesta in July 2011 and departed in September 2012 for the dwarf planet Ceres.
Europe's Rosetta Comet Mission
An artist's illustration of Rosetta's Philae lander on the surface of Comet 67P/Churyumov-Gerasimenko. Rosetta is due to arrive at the comet in mid-2014.
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Michael Wall is a Senior Space Writer with Space.com and joined the team in 2010. He primarily covers exoplanets, spaceflight and military space, but has been known to dabble in the space art beat. His book about the search for alien life, "Out There," was published on Nov. 13, 2018. Before becoming a science writer, Michael worked as a herpetologist and wildlife biologist. He has a Ph.D. in evolutionary biology from the University of Sydney, Australia, a bachelor's degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what his latest project is, you can follow Michael on Twitter.