When galaxies collide, they can change in shape and structure. In the Cartwheel galaxy, which looks a bit like a wagon wheel, a colorful ring surrounds an even brighter inner ring -- both of which ...

"The fact that there is only around a 50-50 chance of a merger was very surprising." ...

When galaxies collide, they can change in shape and structure. In the Cartwheel galaxy, which looks a bit like a wagon wheel, a colorful ring surrounds an even brighter inner ring -- both of which ...