Saturn's moon, Mimas, not only looks like the Death Star, it also has a Pac Man heat signature.
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In the last 7 years, humanity has discovered 43 potentially habitable planets.
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The earth travels through space at 660,000 miles per hour.
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On Titan, Saturn's largest moon, the atmosphere is so thick and the gravity so low that humans could fly through it by flapping "wings" attached to their arms.
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If two pieces of metal touch in space, they become permanently stuck together.
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An international team of astronomers has spotted the farthest known gravitational lens and, as Albert Einstein predicted, it is a galaxy that deflects and intensifies the light of a much further object.
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The last time that the Sun was in its current position in space around the Milky Way, dinosaurs ruled the Earth.
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