all about stars

stars are massive, they are they are luminous spheres made of gas and what holds it together is something called gravity.
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what are the different sizes between the planet earth, jupiter and the sun ? the earth is 12,756 km , jupiteris 142,800 km and the sun is 1,392,000 km

the sun was formed in a nebula (a huge diffuse cloud of gas) same as other stars

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