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Asked by no1prosecutorye to Angus, Christian, Hannah, Laura, Simon on 20 Jun 2013.
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Angus Ferraro answered on 20 Jun 2013:
The best idea we have so far is that, after the Big Bang, vast clouds of dust and other bits of debris were spread across the universe. Everything (even small things) attracts things through gravity, so this debris started to stick together and form planets and stars and things. The cloud of debris from which these things form wasn’t exactly the same everywhere – some places had more of it than others, so the planets and stars grouped together to form galaxies.
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Simon Holyoake answered on 20 Jun 2013:
The galaxy was formed early in the history of the universe, the big bang spread hydrogen throughout the universe, which condensed into dense clouds, parts of these clouds began to condense further, eventually these clouds became so dense that nuclear fusion began to occur, and the first stars were born. These early stars burned very quickly, fusing hydrogen into heavier elements, then when they began to produce iron, which takes more energy to fuse than you get out of it, they exploded, scattering matter throughout the galaxies, new stars formed from this matter, and the material left over consensed into planets
The very oldest stars in the Milky Way are 13.2 billion years old, almost as old as the universe itself!
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Laura Roberts Artal answered on 20 Jun 2013:
I can’t explain it any better than Simon & Angus already have!
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