Mars had an oxygen-rich atmosphere around 4 billion years ago
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Pluto is smaller than Russia.
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In 1859, the largest known geomagnetic storm struck the Caribbean, causing an aurora and telegraphs could even operate without a power source.
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It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
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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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If NASA sent birds into space they would soon die; they need gravity to swallow.
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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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MDIF, a New York based non-profit organisation, is planning to beam free Wi-Fi to the entire world from space.
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