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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When a massive power outage struck southern California in the 1990s, Los Angeles residents reportedly called 911 to express alarm about strange clouds hovering overhead; they were seeing the Milky Way for the first time.
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It 'snows' metal on Venus.
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A comet's tail always points away from the sun.
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According to a study by the National Science Foundation, only half of Americans believe in evolution, and one in 4 don't know that the Earth orbits the Sun.
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An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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