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Are there are more atoms in a glass of water than stars in the observable universe?
astronomers have put current stellar population at roughly 70 billion trillion ($70*10^22$) Since a glass of water has many moles of water , and each mole contains about $22*10^23$...
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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 do us humans know that there are millions of other galaxies? If galaxies are millions of years apart, how do scientists know that there are billions of other galaxies and that andromeda is the closest?
There are a ton of extremely powerful telescopes both here on Earth and in space that is capable of looking billions of light years far. And we can see a...
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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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Which would be more likely to collide: stars with stars or galaxies with galaxies?
Many galaxies are members of groups or clusters. Since groups and clusters contain so many galaxies relatively close together, it should not be surprising that galaxies sometimes collide with each...
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Which would be more likely to collide, stars with stars or galaxies with galaxies?
Stars tend to exist in a binary setup. That is, two stars orbiting about each other. Our star, , is an exception although there is discussion that maybe a long...
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If galaxies are constantly moving as the universe expands, what prevents the stars within a galaxy from straying off on their own?
gravity is holding the galaxies into shape.
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How do stars in our galaxy differ from stars in other galaxies?
There's not many ways in which stars can differ. The basic ones are the star's mass and the star's fraction of heavy elements (or metals, which is what an astronomer...
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The Hubble telescope captured galaxies in the eastern direction of the universe. Images came back proving that galaxies are made up of different colors. What would explain the reason for the make of colors in galaxies?
Galaxies early on in their lives are actively forming hot, new stars and appear more bluish. Older galaxies are forming fewer new stars and their constituent stars are older on...
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