Nineteen newly discovered dwarf galaxies seem to be missing their dark matter, and physicists aren't sure why.
Standing on one moon, you'd see the other pass overhead twice before ducking around to pass on the other side.
Physicists think this might be the first of many hidden states of matter that could be uncovered using laser flashes.
What's the recipe for a living planet? A new paper suggests that the right number of impacts is a key ingredient.
Mathematicians have uncovered a big new piece of evidence for one of the most famous unproven ideas in mathematics, known as the twin prime conjecture.
Los Alamos physicists want to combine two fusion-power techniques and finally harness the energy source that powers the sun.
If you'd looked up into the sky in Kyoto, Japan, on April 28, 2017, you may have seen a preview of an event that could, far down the road, threaten the whole Earth.
When 'Oumuamua passed through our solar system in 2017, no one could figure out where the object came from. But astronomers think they've worked out how Comet 2I/Borisov got here.
SpaceX has never flown a person into space in its first spacecraft, the Crew Dragon. But already Musk is showing off his big, shiny Starship — and NASA is bristling.
The new experiment demonstrated a bizarre quantum effect from the double-slit experiment at an unprecedented scale.
It probably isn't a black hole, if it exists at all. But two physicists think we should check to see if it's a black hole anyway.
China already had the power to kill you with nukes. This doesn't change anything, but it could fan the flames of an arms race.
The KATRIN experiment has turned up a new, more-precise-than-ever measurement for the barely-detectable neutrino mass.
Activists and politicians have been criticized from the right for saying we have only 12 years to stop climate change. Scientists say the situation is in some ways worse than that.
Often, when we don't have an immediate explanation for something strange in space, some people blame aliens. But better explanations usually come along in time.