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Astrophysics
NASA’s Habitable Worlds Observatory: the future (or end) of NASA science
At the end of July, hundreds of scientists convened to plan NASA's upcoming astrophysics flagship mission. Will the US allow it to happen?
Extreme black hole system OJ 287 just got more interesting
Two supermassive black holes on an inevitable death spiral push the limits of Einstein's relativity. New observations reveal even more.
Laniakea, our home supercluster, is already being torn apart
On the largest scales, galaxies don't simply clump together, but form superclusters. Too bad they don't remain bound together.
5 big unanswered questions about the origin of life
Somewhere, at some point in the history of our Universe, life arose. We're evidence of that here on Earth, but many big puzzles remain.
What we’ve learned after 35 years of NASA’s Hubble
When the Hubble Space Telescope first launched in 1990, there was so much we didn't know. Here's how far we've come.
Ask Ethan: Could our whole Universe be a black hole’s interior?
Once you cross a black hole's event horizon, there's no going back. But inside, could creating a singularity give birth to a new Universe?
The single most amazing fact about the Universe
No matter what it is that we discover about reality, the fact that reality itself can be understood remains the most amazing fact of all.
LIGO’s heaviest black hole demands next-generation science
With over 300 high-significance gravitational wave detections, we now have a huge unsolved puzzle. Will we invest in finding the solution?
How particle physics will continue after the last collider
Will we build a successor collider to the LHC? Someday, we'll reach the true limit of what experiments can probe. But that won't be the end.