Two galaxies are squaring off in Corvus and here are the latest pictures. 
When two galaxies collide, however, the stars that compose them usually do 
not. This is because galaxies are mostly empty space and, however bright, 
stars only take up only a small amount of that space. During the slow, 
hundred million year collision, however, one galaxy can rip the other apart 
gravitationally, and dust and gas common to both galaxies does collide. 
In the above clash of the titans, dark dust pillars mark massive molecular 
clouds are being compressed during the galactic encounter, causing the rapid 
birth of millions of stars, some of which are gravitationally bound together 
in massive star clusters.

----------

The Antennae Galaxies, about 60 million light years from Earth in the 
constellation Corvus, got their nickname from the wispy antennae-like streams 
of gas seen by optical telescopes. These wisps are believed to have been 
produced by the collision between the galaxies that began about 100 million 
years ago and is still occurring. Although it is rare for stars to hit each 
other during a galactic collision, clouds of dust and gas do collide . 
Compression of these clouds can lead to the rapid birth of millions of stars, 
and a few million years later, to thousands of supernovas. The expanding 
bubbles of multimillion degree gas produced by the supernovas can coalesce 
to form superbubbles.