Search
Space
We know of stellar mass and supermassive black holes, but intermediate mass ones have long proved elusive. Until now.
On the largest of cosmic scales, the Universe is expanding. But it isn't all-or-nothing everywhere, as "collapse" is also part of the story.
A long view of biological survival might point us to new possibilities for finding life elsewhere in the Universe.
The near and far sides of the Moon are so different from each other, and no one is sure why. New lunar samples could confirm a wild theory.
CERN's NA64 experiment used a high-energy muon beam technique to advance the elusive search for dark matter, offering new hope for solving one of astronomy's greatest mysteries.
The sharpest optical images, for now, come from the Hubble Space Telescope. A ground-based technique can make images over 100 times sharper.
Although the Big Bang occurred at an instant in time long ago, we still see the light from it. Will the evidence ever disappear completely?
Northern lights in the American South, clusters of huge geomagnetic storms—the Sun is throwing a tantrum right on schedule.
Out beyond Neptune are some fascinating bodies left over from our Solar System's formation. Could one of them truly be spectacular?
To know how to protect its astronauts, NASA needs to first understand the threat.
The expanding Universe, in many ways, is the ultimate out-of-equilibrium system. After enough time passes, will we eventually get there?
We normally think of dark matter as the "glue" that holds galaxies and larger structures together. But it's so much more than that.
There are many theories of gravity out there, and many interpretations of wide binary star data. What have we really learned from it all?
In 2017, we detected gold being forged in a neutron star-neutron star merger. Now, in 2024, the amounts created simply don't add up.
Learning to decode complex communication on Earth may give us a leg up if intelligent life from space makes contact.
The most iconic "dark nebula" of all lights up under JWST's infrared gaze. Here's what's newly discovered inside.
Dark energy is one of the biggest mysteries in all the Universe. Is there any way to avoid "having to live with it?"
Our Universe requires dark matter in order to make sense of things, astrophysically. Could massive photons do the trick?
The Universe is expanding, and the Hubble constant tells us how fast. But how can it be a constant if the expansion is accelerating?
In all the Universe, only a few particles are eternally stable. The photon, the quantum of light, has an infinite lifetime. Or does it?
Yes, the Universe is expanding, but if you've ever wondered, "How fast is it expanding," the answer isn't in terms of a speed at all.
Is the Universe finite or infinite? Does it go on forever or loop back on itself? Here's what would happen if you traveled forever.
There are so many problems, all across planet Earth, that harm and threaten humanity. Why invest in researching the Universe?
Forensics has reached the final frontier, and could be used to solve future space accidents—or crimes.
Well-preserved ancient plants and other finds at the Clarkia fossil beds hint at what kind of evidence any Martian life may have left behind.
From before the Big Bang to Voyager 1, particle physicist Harry Cliff takes us on a whiz-bang tour of the Universe's evolution.
Lasers, mirrors, and computational advances can all work together to push ground-based astronomy past the limits of our atmosphere.
Even if you aren't in the path of totality, you can still use the solar eclipse to measure how long it takes the Moon to orbit Earth.
There are only a precious few minutes of totality during even the best solar eclipses. Don't waste yours making these avoidable mistakes.
The least exciting of all eclipses, a penumbral lunar eclipse, foreshadows the spectacular show that April 8th's total eclipse will bring.