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Astrophysics
We can reasonably say that we understand the history of the Universe within one-trillionth of a second after the Big Bang. That's not good enough.
Some say that the Sun is a green-yellow color, but our human eyes see it as white, or yellow-to-red during sunset. What color is it really?
Archaeologists can learn how societies lived by studying what they left behind when they died. Astronomers are doing much the same thing.
Yes, "the laws of physics break down" at singularities. But something really weird must have happened for black holes to not possess them.
A new, unexpected brightening, just 3 years after a massive dimming event, has astronomers watching Betelgeuse. Is a supernova imminent?
The odds are slim, but the consequences would be literally world-ending. There really is a chance of a black hole devouring the Earth.
The problem of the electroweak horizon haunts the standard model of cosmology and beckons us to ask how deep a rethink the model may need.
Contrary to common experience, not everything needs a medium to travel through. Overcoming that assumption removes the need for an aether.
Recasting the iconic Carrington Event as just one of many superstorms in Earth’s past, scientists reveal the potential for even more massive eruptions from the sun.
The nearby, bright star Fomalhaut had the first optically imaged planetary candidate. Using JWST's eyes, astronomers found so much more.
They're the most common type of exoplanet known today, and many astronomers have called them "super-habitable." None of that is true.
Before there were planets, stars, and galaxies, before even neutral atoms or stable protons, there was the Big Bang. How did we prove it?
The standard model of cosmology has a big new problem: Some galaxies seem to be too old.
This oddball system of three stars might be our best chance at finding nearby life in the Universe.
Einstein's relativity overthrew the notion of absolute space and time, replacing them with a spacetime fabric. But is spacetime truly real?
What began as an annoyance ended as a Nobel Prize-winning discovery about the Big Bang and the origin of the Universe.
Many planets will eventually be devoured by their parent star. For the first time, we caught a star in the act, eating its innermost planet!
The conservation of energy is one of the most fundamental laws governing our reality. But in the expanding Universe, that's just not true.
It's not about fairness. It's about using every possible advantage.
These high-mass, rapidly star-forming galaxies have called modern cosmology into question. But hi-res simulations show no tension at all.
All forms of energy affect the expanding Universe. But if matter and radiation slow the expansion down, how does dark energy speed it up?
The best evidence for dark matter is astrophysical and indirect. Do new lensing observations point to ultra-light, wave-like dark matter?
Once the initial blaze of heat dissipated, the constituent particles of atoms were free to bind.
The cosmic microwave background offers clues.
Finding out how the Universe grew up was the biggest science goal of JWST. This ultra-early proto-galaxy cluster is one amazing discovery.
From quarks and gluons to giant galaxy clusters, everything that exists in our Universe is determined by what is (and isn't) bound together.
The acceptance of our cosmic loneliness and the rarity of our planet is a wakeup call.
John Templeton Foundation
Cosmologists are largely still in the dark about the forces that drive the Universe.
What would become the Big Bang model started from a crucial idea: that the young Universe was denser and hotter.
Like Mars today, Venus used to be a sci-fi superstar. Recent discoveries could re-ignite our interest in Earth’s “evil twin.”