How can we determine if the universe is expanding?
Owen AtkinsonIt is determined by the observation of distant galaxies.
Red shift indicates that almost all of the galaxies we observe—especially those outside of the "local cluster"—are moving away from us.
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Alexander AcostaWhen galaxies move away from us due to the expansion of the universe, the light they emit is stretched, causing its wavelength to increase and shifting it towards the red end of the spectrum. This phenomenon is known as redshift, and it can be used to determine whether the universe is expanding.
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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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