Why do the planets all orbit in planes very close to the ecliptic?
All objects in solar system formed from a disk of gas and dust called solar nebula.
The solar nebula, a spinning disk of gas and dust, is where the solar system originated. The image should be self-explanatory.
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The planets orbit in planes close to the ecliptic due to the protoplanetary disk's initial angular momentum and gravitational interactions during the solar system's formation.
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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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