If our universe were made of antimatter, what would it look like?
Dark Matter Isn’t Warm And Fuzzy
A new survey of distant quasars shows that dark matter isn’t warm and fuzzy.
How To Define Distance In An Expanding Universe
On a cosmic scale the notion of distance is more subtle than you might think.
Bigger, Stronger, Faster
New observations of lensed quasars show the Universe is expanding faster than expected. But these results raise questions about the assumptions of our cosmological models.
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.
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?