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How many stars are in an average galaxy? How many galaxies are there in the observable universe?
There are billions of galaxies with billions or trillions of stars in each. So, we can't really calculate the $ of stars, so the best response would be infinite.
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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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In what order do these astronomy terms go from smallest to biggest: Earth, Universe, Milky Way galaxy, Jupiter, Asteroid, and the Sun?
Asteroid, Earth, Jupiter, Sun, Milky Way (galaxy), universe. They will often miss out one or more terms and may add in others e.g. comet instead of asteroid. You also need...
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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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Does the expanding universe model mean that our Milky Way galaxy is at the center of the universe?
The expanding universe model describes universal inflation. Every spatial point in the universe is expanding simultaneously. No one thing is at the center of the universe. People often relate...
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A cepheid variable in a nearby galaxy looks "10^6" times fainter than an identical Cepheid in the Milky Way? The Cepheid in the Milky Way is 1000 parsecs away. How far away is the nearby galaxy?
The absolute brightness (i.e. number of photons per unit time for a fixed size detector) decreases as the square of the distance. To prove this for yourself, think of the...
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Can we detect an accretion disk around the Milky Way's supermassive black hole in the core of the Milky Way?
If there was an accretion disc around the Milky Way's central supermassive black hole it would emit massive amounts of radiation. The supermassive black hole has consumed most of the...
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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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Are there any other galaxies, aside from the Milky Way, that could possibly contain planets that have life?
We have just begun to examine exoplanets in our Galaxy and found suitable candidates. There is no reason to rule out the possibility of other Galaxies harbouring exoplanets which are...
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Why are spiral galaxies the most commonly observed galaxies?
The exact mechanism for the formation of the spiral arms continues to puzzle scientists. Scientists think they could be a result of density waves traveling through the outer disk....
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