“So, it's really for practical reasons that we've chosen oxygen.”

NASA · Nov 1 · Hubble finds dwarf galaxies missing most oxygen produced by their stars

“Oxygen is one of the primary elements formed by stars. Being able to trace how much oxygen gets made, and then how much is distributed inside and outside of galaxies, helps us understand galaxy evolution.”

NASA · Nov 1 · Hubble finds dwarf galaxies missing most oxygen produced by their stars

“It also helps us learn where and how much galaxies are enriching the space between galaxies, called the intergalactic medium.”

NASA · Nov 1 · Hubble finds dwarf galaxies missing most oxygen produced by their stars