Stars we see in the sky are made up off very hot gas. These give off light, just like out closest star, the sun and thats what we see but just very far away.
One thing I always find really cool about the light you see in the sky is that some of the stars may have actually died thousands of years ago; light takes so long to travel through space towards Earth that the star may not be there any more but we can still see the light, kinda like looking back in time đŸ™‚
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