Day 2
Although it's scientifically possible, astronomers are pretty certain it doesn't. If this system did exist, it's likely that the gravitational pull from Earth would quickly destabilize the moon's moon eventually pulling it out of orbit, although it's certainly possible if the moon was small and it was far away from Earth that it wouldn't adjust our tidal forces - but it may well be a reality on some similar planet far, far away from us!
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