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Dark Matter
Only 5% of the Universe is made of normal "stuff" like we are. Could there be dark matter or dark energy life, or even aliens, out there?
Historically, astronomers have often named things creatively, bizarrely, and often inaccurately. But which terms are the most egregious?
Here in our Universe, both normal and dark matter can be measured astrophysically. But only normal matter can collapse. Why is that?
First discovered in the mid-1960s, no cosmic signal has taught us more about the Universe, or spurred more controversy, than the CMB.
Scientists just viewed one of the tiniest, most isolated, lowest-mass galaxies ever found with JWST. Despite all odds, it's still growing.
In the year 2000, physicists created a list of the ten most important unsolved problems in their field. 25 years later, here's where we are.
A recent measurement has simultaneously settled an ongoing scientific debate while puzzling scientists.
On larger and larger scales, many of the same structures we see at small ones repeat themselves. Do we live in a fractal Universe?
It's not only the gravity from galaxies in a cluster that reveals dark matter, but the ejected, intracluster stars actually trace it out.
There was a lot of hype and a lot of nonsense, but also some profoundly major advances. Here are the biggest ones you may have missed.
It was barely a century ago that we thought the Milky Way encompassed the entirety of the Universe. Now? We're not even a special galaxy.
DESI has allowed astronomers to create an unprecedented 3D map of the Universe representing 20% of the entire sky.
Two parts of our Universe that seem to be unavoidable are dark matter and dark energy. Could they really be two aspects of the same thing?
The most massive early galaxies grew up faster, and have more stars, than astronomers expected, according to JWST. What does it all mean?
There are a few small cosmic details that, if things were just a little different, wouldn't have allowed our existence to be possible.
The last naked-eye Milky Way supernova happened way back in 1604. With today's detectors, the next one could solve the dark matter mystery.
The race to find dark matter could grow more complex with high-energy neutrino interference.
NASA's space telescopes and observatories bring humanity unrivaled science images and scientific discoveries. Here's what should be next.
More than two years after JWST began science operations, our Universe now looks very different. Here are its biggest science contributions.
What are dark matter and dark energy? The large-scale structure of the cosmos encodes them both, with ESA's Euclid mission leading the way.
The most common visual depictions of the history of the Universe show the Big Bang as a growing tube with an "ignition" point. Why is that?
An in-depth interview with astronomer Kelsey Johnson, whose new book, Into the Unknown, explores what remains unknown about the Universe.
There are a number of factors to consider when choosing where to build a telescope. These 3 locations, on their merits, surpass all others.
Watching for changes in the Red Planet’s orbit over time could be new way to detect passing dark matter.
Today, the deepest depths of intergalactic space aren't at absolute zero, but at a chill 2.73 K. How does that temperature change over time?
In theory, dark matter is cold, collisionless, and only interacts via gravity. What we see in ultra-diffuse galaxies indicates otherwise.
In all directions, at great distances, the Universe looks younger, more uniform, and less evolved. Does that mean Earth must be the center?
A recent experiment challenges the leading dark matter theory and hints at new directions for uncovering one of the Universe's biggest mysteries.
The Lyman-α emission line has never been seen earlier than 550 million years after the Big Bang. So why does JADES-GS-z13-1-LA have one?
The observation that everything we know is made out of matter and not antimatter is one of nature's greatest puzzles. Will we ever solve it?