This image from the NASA/ESA Hubble Space Telescope shows part of a bubble nebula, called Sh2-308, surrounding the massive star EZ Canis Majoris. Very intense radiation from EZ Canis Majoris pushes Sh2-308 out further and further, blowing it bigger and bigger. Image credit: NASA / ESA / Hubble. EZ Canis Majoris is approximately 5,200 light-years from Earth. It is something known as a Wolf-Rayet star, and is one of the brightest known stars of its...