Why is the solar system flat? Do the planets revolve around the sun on a 2D plane?
The solar system is not quite flat and all of the planets' orbits are slightly inclined.
The solar system is almost all in a plane because it was formed from a relatively flat disk of material.
The solar system is however nor 2 dimensional. All of the planets have orbits which are inclined at slightly different angles.
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The planets generally orbit the sun in a flat plane, but their orbits are not perfectly 2D; they have small inclinations. The solar system is flat because of how it formed from a rotating disk of gas and dust.
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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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