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Transcript
Big Bang and the Formation of Stars and Galaxies – Fact Sheet

The universe started about 13 billion years ago

The whole universe started out the size of an orange

At the start the temperature is 1,000 billion degrees centigrade

As the Universe expanded, it cooled down and hydrogen atoms are formed

Hydrogen gas clouds are drawn together through the force of gravity.

In the centre of the cloud it becomes incredibly hot until a nuclear explosion sends out heat and
light and a star is born.

A hundred billion stars form together and a galaxy is created.

In the centre of some galaxies is a black hole. Everything nearby gets pulled into a black hole;
stars, dust clouds, even light – it all gets sucked in and disappears.