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Universe Expansion
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?
It took 9.2 billion years of cosmic evolution before our Sun and Solar System even began to form. Such a small event has led to so much.
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.
Our own galaxy, the Milky Way, is both completely normal and absolutely remarkable in a number of ways. Here's the story of our cosmic home.
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.
Want to avoid getting "spaghettified" by a black hole? Steer clear of the smaller ones.
Astronomers claim to have found structures so large, they shouldn't exist. With such biased, incomplete observations, perhaps they don't.
Here in our Solar System, we only have one star: a singlet. For many systems, including the highest-mass ones, that's anything but the norm.
Two scientists recently wagered a bottle of whiskey. The bet? Whether we'll find evidence of advanced extraterrestrial life in the next 15 years.
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.
Planets can be Earth-like or Neptune-like, but only rarely are in between. This hot, Saturn-like planet hints at a solution to this puzzle.
Finding it at all was a happy accident. Examining it further may help unlock the secrets hiding within the earliest galaxies of all.
A new measurement offers insights on the density of the mysterious force driving the Universe's expansion.
Here's why the answer may forever elude scientists.
Today, the star-formation rate across the Universe is a mere trickle: just 3% of what it was at its peak. Here's what it was like back then.
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.
As early as we've been able to identify them, the youngest galaxies seem to have large supermassive black holes. Here's how they were made.
For 550 million years, neutral atoms blocked the light made in stars from traveling freely through the Universe. Here's how it then changed.
Even after the first stars form, those overdense regions gravitationally attract matter and also merge. Here's how they grow into galaxies.
The first stars in the Universe were made of pristine material: hydrogen and helium alone. Once they die, nothing escapes their pollution.