How do scientists estimate the number of galaxies in the universe?
We have counted them using optical ground-based and space telescopes. However we will never know how many galaxies there are outside of the observable universe.
Using telescopes such as the Hubble space telescope we have seen the most distant of galaxies scraping the edge of the light horizon. The light horizon is the where beyond it light has not has reached us,
Scientists also use the density of the universe to estimate the amount of galaxies in our observable universe.
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By using telescopes like the Hubble Space Telescope to conduct sky surveys and analyze the distribution of galaxies across different regions, scientists are able to estimate the total number of galaxies in the observable universe by counting the number of galaxies within a small portion of the sky and extrapolating this count to the entire universe.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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