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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 big one!!
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