Does the density of the universe change over time?
Yes. But maybe no.
The universe is expanding faster than we can currently see it, which means that space is getting less dense as the distances between constellations get bigger.
EXCEPT that, if string theorists are correct, the universe's density will essentially remain constant because they propose that everything we take to be empty, like space, is actually filled with "strings."
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Indeed, the universe's density varies with time. The expansion of the universe since the Big Bang has caused it to decrease.
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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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- Which galaxy is closest to us?
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