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Why Mars appears to be moving backward

8 years 2 months ago
Our solar system is in constant motion, with all eight planets — and dwarf planet Pluto — orbiting the sun. Most of those planets are visible from Earth, even to the naked eye. If you track them in the sky night after night, you'll notice that their position changes slightly; as they orbit the sun, they appear to move from west to east against a fixed backdrop of distant stars.
Mindy Weisberger, Senior Writer

Mercury's crust might be thinner than anyone thought

8 years 2 months ago
After NASA's Mercury Surface, Space Environment and Geochemistry Ranging (MESSENGER) mission ended in 2015, the crust of the solar system's innermost planet was thought to be roughly 22 miles (35 kilometers) thick. However, one scientist now disagrees.
Scott Snowden, Space.com Contributor
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8 minutes 34 seconds ago
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