Call your astrologer! What does it mean when one galaxy passes in front of another? I'm guessing it means you'll find love, or spontaneous human combustion or something. Ground-based telescopes saw these overlapping galaxies as a single blob, but the Hubble Space Telescope was able to distinguish two different galaxies, a small one passing in front of a larger one, both about 780 million light years away. [Hubblesite]