In 1920, astronomers debated the nature of the Universe. The results were meaningless until years later, when the key evidence arrived.
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The Universe gravitates so that normal matter and General Relativity alone can’t explain it. Here’s why dark matter beats modified gravity.
The Universe isn’t as “clumpy” as we think it should be.
The Universe begins with negligible amounts of angular momentum, which is always conserved. So why do planets, stars, and galaxies all spin?
You are trapped in time. You never live in the world as it is but only as you experience it as it was.
The odds are slim, but the consequences would be literally world-ending. There really is a chance of a black hole devouring the Earth.
Everything we observe beyond our Local Group is speeding away from us, omnidirectionally. If the Universe is expanding, where is the center?
The Universe certainly formed stars, at one point, for the very first time. But we haven’t found them yet. Here’s what everyone should know.
The most common element in the Universe, vital for forming new stars, is hydrogen. But there’s a finite amount of it; what if we run out?
Unexpected images of galaxies from the James Webb Space Telescope do not disprove the Big Bang. There are other likelier explanations.
Earth wasn’t created until more than 9 billion years after the Big Bang. In some lucky places, life could have arisen almost right away.
We knew we’d find galaxies unlike any seen before in its first deep-field image. But the other images hold secrets even more profound.
Early relics and late-time objects give incompatible results for the expanding Universe. This independent anomaly intensifies the problem.
Back during the hot Big Bang, it wasn’t just charged particles and photons that were created, but also neutrinos. Where are they now?
What do the dark recesses of the early Universe and Zelda: Tears of the Kingdom have in common? More than you could have ever hoped for.
Life arose on Earth very early on. After a few billion years, here we are: intelligent and technologically advanced. Where’s everyone else?
With such a vast Universe and raw ingredients that seem to be everywhere, could it really be possible that humanity is truly alone?
Since its observation discovery in the 1990s, dark energy has been one of science’s biggest mysteries. Could black holes be the cause?
The first set of James Webb’s images blew us all away. In just 2 mere months, it’s seen highlights that no one could have predicted.
There are plenty of life-friendly stellar systems in the Universe today. But at some point in the far future, life’s final extinction will occur.
Forget billions and billions. When it comes to the number of galaxies in the Universe, both theorists’ and observers’ estimates are too low.
Two fundamentally different ways of measuring the expanding Universe disagree. What’s the root cause of this Hubble tension?
IceCube just found an active galaxy in the nearby Universe, 47 million light-years away, through its neutrino emissions: a cosmic first.
There are 40 billion billion black holes in the universe. Here’s how our Solar System stacks up against ten of them.
The key problem with the dark matter hypothesis is that nobody knows what form dark matter might take.
Ever wonder what would happen if we got sucked into a black hole? Turns out we could live in it for a while — if it was big enough.
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Yes, dark energy is real. Yes, distant galaxies recede faster and faster as time goes on. But the expansion rate isn’t accelerating at all.
Even with only 12.5 hours of exposure time, James Webb’s first deep-field image taught us lessons we’ve never realized before.
The hot Big Bang was an energetic, brilliantly luminous event. Today’s Universe is alight with stars. But in between, the dark ages ruled.
As time goes on, dark energy makes distant galaxies recede from us ever faster in our expanding Universe. But nothing truly disappears.