Is it true that the expansion of the universe means that stars in our Milky Way Galaxy are getting increasingly farther apart?

Md Ariful Islam

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Md Ariful Islam

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Within a galaxy gravity holds the stars togeher against the cosmic expansion. Stars inside a galaxy are simply too close together for cosmic expansion to "beat" gravity. Similarly, planets are held in place around their respective stars and moons around planets. Cosmic expansion overcomes gravity only on intergalactic distance scales.

Not even all pairs of galaxies are moving away from each other. Galaxies can have relative motion other than the cosmic expansion, and for instance Andromeda is moving towards the Milky Way on its way to a collision (in about 4 billion years).

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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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