observations of light and matter

ELI5: If the age of the universe is about 14 billion years old how come the diameter of the universe is 93 billion light years?

Because space itself can expand faster than the speed of light.
The speed of light is the fastest anything can move through space. Space itself, however, doesn’t have that limitation in expansion.

Also worth mentioning that is only the observable universe that is 93 billion light years in diameter. No matter where you are in the universe, you can only observe the 93-billion-light-year sphere centered at your location. Move beyond that edge, and your sphere just has a different center. You’ll never observe the entire universe. As such, we have no reason to believe the universe has a edge at all. It may be much MUCH wider than 93 billion light years, or it may be truly infinite.

Explain Like I`m Five: good questions, best answers.


Mostly Mute Monday: Dark Matter’s Secrets Revealed By Colliding Galaxy Clusters

“Dark matter’s separation from normal matter indicates that the matter we’re used to — protons, neutrons & electrons — is not responsible for most of the mass of the Universe! Instead, every colliding group of galaxies we observe shows this separation of total mass from the light-emitting gas.”

Dark matter is a puzzle that’s now more than 80 years old: the presence of all the known, observable, detectable normal matter — the stuff in the standard model — cannot account for the gravitation of the astronomical objects we observe. But despite our inability to create or detect it in a laboratory, we’re certain of its existence in the Universe. The true test of this comes from colliding galaxy clusters, which show a distinct separation between all the known “normal” components, which collide, heat up and emit light, and the gravitational components, which very clearly don’t. At this point, over a dozen distinct colliding clusters show this effect, from some of the smallest known galactic groups to the largest colliding cluster in the Universe: El Gordo.