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Do stars exist in space between galaxies or are stars confined solely to galaxies?
It's very rare but a star can be created outside a galaxy. I don't have any examples but they exist and it's rare.
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One estimate is that there are 1010 stars in the Milky Way galaxy, and that there are 1010 galaxies in the universe. Assuming that the number of stars in the Milky Way is the average number, how many stars are in the universe?
I assume that your 1010 means $10^10$. Then the number of stars is simply $10^10*10^10=10^20$.
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How often do stars explode in the universe? Are there so many stars that there are millions exploding all of the time?
It has been estimated that in our Milky Way galaxy there is a supernova explosion every 50 years. Given that the Hubble telescope has detected some 150 billion galaxies, this...
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Edwin Hubble discovered the universe was expanding by measuring the light of distant stars, and by showing that those distant stars were moving further away from the earth. If this is so, then why is the Andromeda Galaxy moving closer to us?
Andromeda is being pulled apart by the expanding universe. But the gravity between the Milky Way and Andromeda is strong enough to overcome this expansive force. Gravity is pretty...
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Why do some dying star form into a white dwarf, while others form into neutron stars or black holes?
It all depends upon the mass of a Star. Main sequence stars like our Sun will burn their fuel for about 9-10 Billion years before becoming a Redgiant. In this...
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Why are there so many dwarf stars (red and white) among the nearest stars, but none among the brightest stars?
There is a different story for each type of dwarf star that we cannot see. if you are considering Proxima-Centauri, Proxima-Centauri though is the closest Star to but at the...
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If stars can form from the explosion of other stars, then why doesn't all the matter in the universe collect together continuously and explode?
Stars are formed when pools of gases come together through gravity. You can see these pools of gases on the NASA website by looking at pictures from the Hubble telescope....
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How do nebula form stars? If all the hydrogen is already fused by the dead star. how are new stars are born with a fresh supply of hydrogen?
Fusion reactions in stars only takes place in the core or the layers around the core where temperatures and pressures are high enough. When a large star comes to the...
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What enables us to see different stars and constellation during different seasons?
See the drawing showing how our sky changes with different position of earth. Picrture from atropos as arizona.EDu.
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What are 6 major stars in the constellation Ursa Major?
most stars have Arabic names. diagram from Wikipedia.
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