How close was the Moon to the Earth during it's formation?

Answer 1

We may never know!

Although i have replied we may never know, we may make a hypothesis! This is what most scientists do to make a unified theory about the universe, by assuming variables.

So, when the Earth was made, the moon definitely would have been closer but we do not have strong evidence for it.

The moon today keeps moving farther away from us, hence we can tell that the moon was pretty close.

We can also tell this by the intensity of the tides in the past. If tides had been larger, then the moon could have been closer.

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Answer 2

Alexander Acosta

The Moon was roughly 22,500 kilometers (14,000 miles) from Earth when it formed.

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Answer from HIX Tutor

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.