#planetary-nebula

brightness_7 What is the difference between a planetary nebula and an HII region?

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

brightness_7 What is the difference between a planetary and diffuse 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

science What is the difference between a planetary nebula and a supernova?

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

science What is the difference between a planetary nebula and a supernova remnant?

Planetary nebulae and supernova remnants are both fascinating astronomical phenomena, but they are actually quite different. A planetary nebula is... Read more