#planetary-nebula
Nebulae are clouds of gas and dust in space, where stars are born and die. They come in a variety of shapes and sizes, but two common types are... Read more
Planetary nebulae and HII regions are two types of nebulae found in space. Planetary nebulae are formed by the ejected outer layers of dying low to... Read more
A planetary nebula is a type of emission nebula consisting of an expanding glowing shell of ionized gas ejected from old red giant stars whereas a... Read more
Planetary nebulae and supernova remnants are both fascinating astronomical phenomena, but they are actually quite different. A planetary nebula is... Read more