<p>The moon was first formed billions of years ago when a Mars-sized object crashed into Earth. The pieces formed over time to create our moon. Why was only one moon formed? Could Earth have had other moons that no longer exist?</p>

CC BY-SA 4.0
2021-05-18T08:51:13.537Z
BTW, welcome to our site! I think you've asked a good question (+1!) about why the debris from the hypothesised impact of Theia didn't coalesce into two smaller moons, but when I looked at the answer to the linked question, I realised it explains why. If your post does get closed as a duplicate of that earlier question, don't be discouraged: if you get another upvote and (maybe) another comment, your question stays in our library and can provide a signpost for others who might have a similar query but would otherwise not have found their way to the main question and its answer. :-)
Chappo Hasn't Forgotten
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2021-05-18T09:16:58.677Z
I similarly upvoted and voted to close. This is a good question, but a nice answer already exists.
David Hammen
<the-moon><earth>
Why does Earth have only one moon?
chowder
# Why does Earth have only one moon?

(Asked by: username_0 on 2021-05-18)

The moon was first formed billions of years ago when a Mars-sized object crashed into Earth. The pieces formed over time to create our moon. Why was only one moon formed? Could Earth have had other moons that no longer exist?

**Tags:** the-moon, earth
> **Comments:**
> **username_1**: BTW, welcome to our site! I think you've asked a good question (+1!) about why the debris from the hypothesised impact of Theia didn't coalesce into two smaller moons, but when I looked at the answer to the linked question, I realised it explains why. If your post does get closed as a duplicate of that earlier question, don't be discouraged: if you get another upvote and (maybe) another comment, your question stays in our library and can provide a signpost for others who might have a similar query but would otherwise not have found their way to the main question and its answer. :-)  
> **username_2**: I similarly upvoted and voted to close. This is a good question, but a nice answer already exists.  

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