Do all the planets in our solar system orbit the sun in a single plane?

Question by Ravi: Do all the planets in our solar system orbit the sun in a single plane?
Do all the planets orbit the sun in a single plane, or do they have their own planes of orbit (forming an ellipsoid)?

I suspect that they are not all in a single plane. This is because, when we see the planets in the sky, we need to look above into the sky, each planet seen at various angles from the Earth's horizon. Further, if all the planets were in the same plane we should not have been able to see

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