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Cosmology
You can only create or destroy matter by creating or destroying equal amounts of antimatter. So how did we become a matter-rich Universe?
Because of dark energy, distant objects speed away from us faster and faster as time goes on. How long before every galaxy is out of reach?
Given enough time, all galaxies will expel their star-forming material and wind up dead. Is this the earliest one, or is it just asleep?
Here's the case for why science can't keep ignoring human experience.
Ground-based facilities enable the greatest scientific production in all of astronomy. The NSF needs to be ambitious, and it's now or never.
To Fred Hoyle, the Big Bang was nothing more than a creationist myth. 75 years later, it's cemented as the beginning of our Universe.
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Is information intrinsic in our universe? NASA’s Michelle Thaller explains.
JWST has puzzled astronomers by revealing large, bright, massive early galaxies. But the littlest ones pack the greatest cosmic punch.
The second law of thermodynamics tells us that entropy always increases. But that doesn't mean it was zero at the start of the Big Bang.
Almost every large structure in the Universe displays a 5:1 dark matter-to-normal matter ratio. Here's how some galaxies defy that rule.
In the early stages of our Solar System, there were three life-friendly planets: Venus, Earth, and Mars. Only Earth thrived. Here's why.
The $21.5-billion project could involve tunneling hundreds of feet under Lake Geneva.
In 1924, Edwin Hubble found proof that the Milky Way isn't the only galaxy in the Universe.
The Universe didn't begin with a bang, but with an inflationary "whoosh" that came before. Here are the biggest questions that still remain.
As planets with too many volatiles and too little mass orbit their parent stars, their atmospheres photoevaporate, spelling doom for some.
The DUNE project will beam tiny neutrinos across vast distances. But the first step involved moving a heavier material: 1 million tons of rock.
Without wormholes, warp drive, or some type of new matter, energy, or physics, everyone is limited by the speed of light. Or are they?
Early on, only matter and radiation were important for the expanding Universe. After a few billion years, dark energy changed everything.
Stars are born, live, and die within the spiral arms of galaxies like the Milky Way. These 19 JWST spirals deliver unprecedented riches.
If our Milky Way were located in the Virgo cluster instead of the Local Group, chances are we'd already be a "red and dead" galaxy.
Millennia ago, philosophers like Anaximander grasped that nature is the ultimate recycler.
On the largest cosmic scales, galaxies line up along filaments, with great clusters forming at their intersection. Here's how it took shape.
Astronomers claim to have found structures so large, they shouldn't exist. With such biased, incomplete observations, perhaps they don't.
The pattern 1, 1, 2, 3, 5, 8, 13, etc., is the Fibonacci sequence. It shows up all over nature. But what's the full explanation behind it?
Today, supermassive black holes and their host galaxies tell a specific story in terms of mass. But JWST reveals a different story early on.
Observations of an enormous cosmic structure, dubbed the "Big Ring," seem to violate the Copernican principle.
For every proton, there were over a billion others that annihilated away with an antimatter counterpart. So where did all that energy go?
One newly discovered, ancient star has a composition unlike any other. Explaining its existence is already blowing astronomers' minds.
A new measurement offers insights on the density of the mysterious force driving the Universe's expansion.
The cosmic scales governing the Universe are almost unbelievably large. What if we shrunk the Sun down to be just a grain of sand?