Blue hypergiants vs Red hypergiants 3D size comparison, the red stars are cooler than blue one and also red giant stars are bigger in size than blue giant stars. The red and blue hypergiants are evolved stars and they are called hypergiants because of their big size and very high luminosity. The luminosity class of Blue hypergiants is "Ia-0 or la+". Only high mass stars become red and blue hypergiants like O and B type stars. Very high mass stars directly become wolf rayet star. And some of blue hypergiants become red hypergiants as they grow in size and cool in temperature. In between the transition to blue to red hypergiants they called yellow hypergiants. #hypergiantStar #blueHypergiant #redHypergiant ... https://www.youtube.com/watch?v=oaHlcF9nHUk

NGC 3109 irregular galaxy in Space Engine Exploring some cool hot planets #simulation #galaxy #space ... https://www.youtube.com/watch?v=ktxbJRQPM8g