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Hi cloud,
Stars come in many different kinds, colours, and sizes.
Our Sun, which is a “normal” sort of star, is about 1.4 million km across.
There are also really big stars called red giants, than can be about as large as Earth’s orbit around the sun (so if the Sun were a red giant — and it will be, one day!) it would swallow up Mercury, Venus and probably Earth as well.
Then there are abnormal stars called white dwarfs and neutron stars, which are made of very different material to normal stars: exotic and extremely dense (heavy) material. Neutron stars are only about 20-30km across, but weigh more than the Sun! (One teaspoon of neutron star material weighs about as much as 100 billion cars.)
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