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Galaxies, stars and planets
Galaxies, stars and planets

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Figure 17 Cosmic time, from the Big Bang, about 13.7 billion years ago, to the present. The first galaxies may have formed less than one billion years after the Big Bang. The Sun and the Earth formed about 4.6 billion years ago, when the Universe was about 9 billion years old.

 7 'We are stardust'