NGC 4676 – this spectacular pair of mighty spirals which are colliding, merging and pulling each other apart – are known as The Mice Galaxies due to the long tails seen in both! As there is a difference between gravitational pulls on the near and far parts of the galaxies, it produces a tidal force that results in these spectacular long tails. This pair is expected to eventually merge into a single giant galaxy. It presents a view of what might happen when Milky Way and Andromeda collides some billions of years later.
This picture has been clicked by Hubble Space Telescope of NASA in 2002.