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Stars Questions

Are stars important
How have some stars had time to die since the universe began?
How many stars are there in the whole universe?
I saw a bright star low but not too low in the northwest but i dont know which star it is nor in which constellation, it was flashing from red to blue, could you tell which star it is please?
The brightest stars in a young open cluster will be/
What does supernova mean?
What is a red dwarf?
What is a white hole?
What is the brightest star in the sky?

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Category: astronomy