In the last 7 years, humanity has discovered 43 potentially habitable planets.
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Jupiter's moon Ganymede, is larger than the planet Mercury!
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The heart of an astronaut actually gets smaller when in outer space.
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It 'snows' metal on Venus.
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All of the Earth's continents are wider at the north than in the south - and nobody knows why.
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Not only are there rogue planets floating through space completely alone, not orbiting any stars, but it’s possible that these pitch-black lonely planets support life.
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Mars had an oxygen-rich atmosphere around 4 billion years ago
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