Antenna Galaxies Colliding.
Here, a collision between two galaxies in Corvus has been captured in a composite image generated by Hubble (gold), the Chandra X-ray Observatory (blue), and the Spitzer Space Telescope (red). In a collision like this, one galaxy can still rip the other apart gravitationally, even if the stars within usually do not collide. That’s because stars make up only a very tiny percentage of space within a galaxy. Instead, dark dust pillars show where massive molecular clouds are being compressed during the galactic encounter, causing the rapid birth of millions of stars. The most massive of those stars will have already spent their millions-of-years long lives and exploded into supernovas.
The collision started 100 million years ago and is still happening.