How close can planets safely exist from each other?

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In summary, the distance between planets varies depending on their orbits and positions in the solar system. It is typically measured in astronomical units (AU) or kilometers, with one AU being equal to the average distance between the Earth and the Sun. The closest planet to Earth is Venus, while the farthest is Neptune. The distance between planets changes due to their elliptical orbits, causing them to sometimes be closer or farther away from each other as they orbit the Sun.
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ghost77
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Theoretically, what would be the closest one planet could safely exist away from another?
 
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Do you mean "in their orbits", or do you mean "sitting next to each other" (such as a double planet system)?

In their orbits, the closer they are the less long-term stability they'll have.

If orbiting each other, they'll have to be outside the Roche limit (wiki this).
 

What is the distance between planets?

The distance between planets varies depending on their orbits and positions in the solar system. The average distance between Earth and Mars, for example, is about 140 million miles.

How is the distance between planets measured?

The distance between planets is typically measured in astronomical units (AU) or kilometers. One AU is equal to the average distance between the Earth and the Sun, which is about 93 million miles.

What is the closest planet to Earth?

The closest planet to Earth is Venus, with an average distance of about 26 million miles.

What is the farthest planet from Earth?

The farthest planet from Earth is Neptune, with an average distance of about 2.7 billion miles.

Why does the distance between planets change?

The distance between planets changes because they all have elliptical orbits, meaning they are not perfectly circular. This causes them to sometimes be closer or farther away from each other as they orbit the Sun.

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