Hubble? The space-based telescope, not the corspe of the dead astronomer.
A better question would be "why don't we ever point the Hubble at things. Now, understand I have no idea where the Hubble is other than "in space", I have no idea if it can move, no idea if it can focus on things less than millions of light years away, and no idea if anything like "the Earth" would have been between the Hubble and the flying rock.
So it really was just a question, I would like to know why we never see pictures of Mars or anything else other than galaxies far-far away.