The moon has been hit thousands of times by all sorts of cosmic debris. The evidence is there. No atmosphere on the moon preserves the craters for us to see. Most of the craters are from long ago when the solar system was forming and there were many more objects in the system. That being said, objects do and will impact both the moon and earth regularly.
If this 10-15m wide asteroid had impacted either one, nothing much would have happened. On earth it probably would have broken apart in the atmosphere. On the Moon, it would have impacted, but probably not that big of a deal.
The bigger you get, the more of a deal it is obviously, but an asteroid of this size is nothing to lose sleep over.
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