An organisation called Mars One is planning to establish a permanent colony of humans on Mars by 2023.
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Neil Armstrong, the first man to step foot on the moon, carried with him a piece of cloth and wood from the original 1903 Wright Flyer.
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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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Only 55% of Americans know that the sun is a star.
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The Earth gets heavier each day by tons, as meteoric dust settles on it.
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There are approximately 3,500 astronomers in the U.S. - but over 15,000 astrologers.
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