The most distant quasar ever observed challenges our understanding of how black holes formed.
A Universe Of Antimatter
If our universe were made of antimatter, what would it look like?
Measuring The Universe With Gravitational Waves
The recent merger of two neutron stars produced both visible light and gravitational waves, and that lets us determine just how fast the universe is expanding.
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.
The Dark Web
A study of thousands of galaxy pairs shows dark matter filaments exist between galaxies.
Who Needs Dark Energy?
Do we really need dark energy to explain cosmic expansion?
Doomsday Scenario
Could the Universe collapse and destroy everything? Probably not.
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.