What is the universe made of? Astronomers face an embarrassing conundrum: they don't know what 95% of the universe is made of. ...
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2 How did life begin?Four billion years ago, something started stirring in the primordial soup. A few simple chemicals got together and made biology .
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The Universe is thought to consist of three types of substance: normal matter, 'dark matter' and 'dark energy'. Normal matter consists of the atoms that make up stars, planets, human beings and every other visible object in the Universe.
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