The cosmos is made up of gas and dust drowned out by the light of stars in interstellar space, which have been present from the start of the known universe.
When we see pictures of galaxies outside the Milky Way, what we re usually looking at is primarily the light of their stars. But stars are far from the only ingredient that makes up a galaxy. Think of stars as the chunks of vegetables in the galact
The Crab Nebula, an iconic supernova remnant in our Milky Way galaxy, was photographed by ESA’s Herschel Space Observatory and the NASA/ESA Hubble Space Telescope. Find out more about this stunning photo.