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Astronomy
The earliest Milky Way-like galaxy, REBELS-25, was spotted rotating about its axis. It's only 700 million years old: 5% of our present age.
Interferometry gave us a black hole's event horizon, but that was in the radio. What can we accomplish with a new optical interferometer?
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?
Physicists recently created Coordinated Lunar Time, a time zone for our Moon.
The Universe has been creating stars for nearly all 13.8 billion years of its history. But those photons can't match the Big Bang's light.
Comet A3, also known as Comet Tsuchinshan-ATLAS, has sprung to life since 2024's last equinox. Here's how to catch the show for yourself.
Scientists might be looking for Martian life in the wrong place.
The Parker Solar Probe is about to undergo its seventh encounter with Venus on its journey toward the Sun. Here's how fast it'll go.
Despite many ultra-distant galaxy candidates found with JWST, we still haven't seen anything from the Universe's first 250 million years.
Just 460 light-years away, the closest newborn protostars are forming in the Taurus molecular cloud. Here are JWST's astonishing insights.
Almost all of the stars, planets, and interesting physics happens in the inner portions of galaxies. Is that conventional wisdom all wrong?
A recent experiment challenges the leading dark matter theory and hints at new directions for uncovering one of the Universe's biggest mysteries.
Most fundamental constants could be a little larger or smaller, and our Universe would still be similar. But not the mass of the electron.
The existence of another watery world in the outer solar system may offer clues to how such seas form — and hope for another spot to search for life.
In the expanding Universe, different ways of measuring its rate give incompatible answers. Nobel Laureate Adam Riess explains what it means.
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?
Galactic activity doesn't just arrive when supermassive black holes feast on matter. Before, during, and after all create fascinating signs.
Although a great many unidentified sights have been seen in the skies, none have conclusively demonstrated the presence of aliens. So far.
The "little red dots" were touted as being too massive, too early, for cosmology to explain. With new knowledge, everything adds up.
Here on Earth, we commonly use terms like weight (in pounds) and mass (in kilograms) as though they're interchangeable. They're not.
So far, Earth is the only planet that we're certain possesses active life processes. Here's what we shouldn't assume about life elsewhere.
Life arose on Earth early on, eventually giving rise to us: intelligent and technologically advanced. "First contact" still remains elusive.
The Universe is 13.8 billion years old, going back to the hot Big Bang. But was that truly the beginning, and is that truly its age?
Many contrarians dispute that cosmic inflation occurred. The evidence says otherwise.
The big question isn't whether the Universe is expanding at 67 or 73 km/s/Mpc. It's why different methods yield such different answers.
The original principle of relativity, proposed by Galileo way back in the early 1600s, remains true in its unchanged form even today.
Most stars in the Universe are located in big, massive, Milky Way-like galaxies. But most galaxies aren't like ours at all.
These missions will put us one step closer to the ultimate goal: crewed trips to Mars.
From size to mass to density and more, each world in our Solar System is unique. When we compare them, the results are truly shocking.
Dark matter's hallmark is that it gravitates, but shows no sign of interacting under any other force. Does that mean we'll never detect it?