Why does the Earth have a tilt but the moon doesn't?

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Are there any explanations, theoretical or otherwise, as to why the Earth has a tilt (causing the seasons) while the moon does not?
 
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The Eart's tilt is probably due to an impact. The moon is tidal locked to Earth, so I don't think the concept of "tilt" even applies to it.
 
The moon does have a tilt of ~6.6 degrees to its orbital plane around the Earth, and ~1.5 degrees to the ecliptic. That 1.5 degree tilt produces slight "seasons" on the Moon.
 
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Thank you. It seemed rather against the odds that the moon would have 0 tilt at all.