In the last 7 years, humanity has discovered 43 potentially habitable planets.
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An international team of astronomers has spotted the farthest known gravitational lens and, as Albert Einstein predicted, it is a galaxy that deflects and intensifies the light of a much further object.
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A comet's tail always points away from the sun.
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Jupiter is bigger than all the other planets combined.
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If two pieces of metal touch in space, they become permanently stuck together.
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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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