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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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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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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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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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Galaxies are millions of light years away and we are able to capture images through cameras in telescopes. Do scientists leave the telescope pointing at space until the galaxies slowly start to appear? Or do they zoom in into space?
A few galaxies are bright enough to see something of them with the naked eye. For example, in the northern hemisphere we can see the centre of the Andromeda Galaxy...
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Why didn't the Apollo astronauts return with pictures of stars and galaxies taken from the Moon's surface? Are stars visible from the surface of the moon?
The utmost advantage ( if any ) is when Moon is in-between a star and the Earth. The apogee distance of Moon from Earth is less than 4.1E+05 km. Stars'...
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If there are an infinite number of stars and infinite number of galaxies, what fills space between two different galaxies?
From recent discoveries of astronomers, they have found out that dark matter is responsible for , and dark energy fuels the dark matter. But dark matter and dark energy are...
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