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Universe Expansion
Along with gravitational lensing and ALMA's incredible long-wavelength spectroscopy, JWST is reshaping our view of the early Universe.
7mins
How the Big Bang gave us time, explained by theoretical physicist.
There might be a hard limit to our knowledge of the Universe.
In Einstein's relativity and the Standard Model, we only have three spatial dimensions. But there could be more, and many think there are.
One study suggested that the "Methuselah Star" is older than the Universe itself.
In just a few seconds, a gamma-ray burst blasts out the same amount of energy that the Sun will radiate throughout its entire life.
Most globular clusters appear to form their stars all at once, but there are exceptions. JWST just observed how "second formations" happen.
Human beings are tiny creatures compared to the 92 billion light-year wide observable Universe. How can we comprehend such large scales?
JWST just found its first transiting exoplanet, and it's 99% the size of Earth. But with no atmosphere seen, perhaps air is truly rare.
JWST has seen more distant galaxies than any other observatory, ever. But many candidates for "most distant of all" are likely impostors.
Most of us have heard that the Sun is an ordinary, typical, unremarkable star. But science shows we're actually anything but average.
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.
In 1920, astronomers debated the nature of the Universe. The results were meaningless until years later, when the key evidence arrived.
As time goes on, dark energy makes distant galaxies recede from us ever faster in our expanding Universe. But nothing truly disappears.
In the grand scheme of the cosmic story, a single year isn't all that significant. But over time, the annual changes really add up!
Since dark matter eludes detection, the mission will target sources of light that are sensitive to it.
6mins
How did complex systems emerge from chaos? Physicist Sean Carroll explains.
In 2020, scientists took more than a kilo of moon rock and soil back to Earth for testing.
Ever since the Big Bang, cataclysmic events have released enormous amounts of energy. Here's the greatest one ever witnessed.
All the things that surround and compose us didn't always exist. But describing their origin depends on what 'nothing' means.
You can lead an overconfident chatbot to expert knowledge, but can it actually learn and assimilate new information?
1hr 33mins
Everything you ever wanted to know about the Universe, explained by physicist Sean Carroll.
Every proton contains three quarks: two up and one down. But charm quarks, heavier than the proton itself, have been found inside. How?
Leaving Hubble in the dust, JWST has officially seen a galaxy from just 320 million years after the Big Bang: at just 2.3% its current age.
The very dust that blocks our view of the distant, luminous objects in the Universe is responsible for our entire existence.
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?
We thought the Big Bang started it all. Then we realized that something else came before, and it erased everything that existed prior.
The answer to this question is key to understanding why anything exists.
By studying the dwarf galaxy Wolf-Lundmark-Melotte ~3 million light-years away, JWST reveals the Universe's star-forming history firsthand.
We confidently state that the Universe is known to be 13.8 billion years old, with an uncertainty of just 1%. Here's how we know.