How do we know other galaxies exist?
We have seen them and we have proof of them.
Other galaxies besides our own have been observed with telescopes and captured on camera; some, such as the Andromeda Galaxy, are known to be visible to the unaided eye since antiquity.
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We know other galaxies exist through observations made using telescopes. These observations include studying the light emitted by stars and other objects in distant galaxies, as well as measuring the movement of these objects.
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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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