In the last 7 years, humanity has discovered 43 potentially habitable planets.
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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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Mars had an oxygen-rich atmosphere around 4 billion years ago
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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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From the nitrogen in our DNA, to the calcium in our teeth, the iron in our blood, to the carbon in our apple pies - all were made in the interiors of collapsing stars; we're all made of stardust.
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If two pieces of metal touch in space, they become permanently stuck together.
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