A new x-ray deep field image supports the idea that supermassive black holes formed before galaxies did.
Antimatter Astronomy
Matter and antimatter emit the same spectra of light. So how do we know that distant galaxies aren’t made of antimatter?
A Light Change
Was the speed of light much faster in the early universe?
The Stars Uncounted
The relativistic effect of gravitational lensing allows astronomers to see the faintest galaxies.
Emergence Of Gravity
A new solution to dark matter argues that gravity is not a fundamental force, but rather an emergent property of entropy.
Order Of Magnitude
If everyone gave names to 200 galaxies, there would still be billions of nameless galaxies in the cosmos.
Sense Of Direction
The Universe has no preferred direction, and that’s a good thing.
The Constant Of Time
The rate of cosmic expansion has changed over time. So why does it look like a constantly expanding universe?
The First Ones
Are we the first civilization to arise in the cosmos?