Yes, the Universe is expanding, but if you’ve ever wondered, “How fast is it expanding,” the answer isn’t in terms of a speed at all.
Is the Universe finite or infinite? Does it go on forever or loop back on itself? Here’s what would happen if you traveled forever.
No matter how good our measurement devices get, certain quantum properties always possess an inherent uncertainty. Can we figure out why?
There are so many problems, all across planet Earth, that harm and threaten humanity. Why invest in researching the Universe?
The majority of the matter in our Universe isn’t made of any of the particles in the Standard Model. Could the axion save the day?
The Universe is 13.8 billion years old, going back to the hot Big Bang. But was that truly the beginning, and is that truly its age?
The center of the galaxy doesn’t just host stars and a black hole, but an enormous set of rich gassy and dusty features. Find out more!
Although human beings arrived on Earth just ~300,000 years ago, we’ve transformed the entire planet completely. Here’s how we did it.
Despite billions of years of life on Earth, humans first arose only ~300,000 years ago. It took all that time to make our arrival possible.
Although mammals may be the dominant form of life today, we’re relative newcomers on planet Earth. Here’s our place in natural history.
For billions of years on Earth, life was limited to simple unicellular, non-differentiated organisms. In a mere flash, that changed forever.
Known as the Great Oxygenation Event, Earth froze over as oxygen accumulated in our atmosphere, nearly driving all life extinct.
First derived by Emmy Noether, for every symmetry a theory possesses, there’s an associated conserved quantity. Here’s the profound link.
A great many cosmic puzzles still remain unsolved. By embracing a broad and varied approach, particle physics heads toward a bright future.
Lasers, mirrors, and computational advances can all work together to push ground-based astronomy past the limits of our atmosphere.
Even if you aren’t in the path of totality, you can still use the solar eclipse to measure how long it takes the Moon to orbit Earth.
There are only a precious few minutes of totality during even the best solar eclipses. Don’t waste yours making these avoidable mistakes.
There are a wide variety of theoretical studies that call our Standard Model of cosmology into question. Here’s what they really mean.
In logic, ‘reductio ad absurdum’ shows how flawed arguments fall apart. Our absurd Universe, however, often defies our intuitive reasoning.
NASA’s only flagship X-ray telescope ever, Chandra, still works and has no planned successor. So why does the President want to kill it?
Physicists just can’t leave an incomplete theory alone; they try to repair it. When nature is kind, it can lead to a major breakthrough.
The least exciting of all eclipses, a penumbral lunar eclipse, foreshadows the spectacular show that April 8th’s total eclipse will bring.
You can only create or destroy matter by creating or destroying equal amounts of antimatter. So how did we become a matter-rich Universe?
No matter how you define the end, including the demise of humanity, all life, or even the planet itself, our ultimate destruction awaits.
Harvard astronomer Avi Loeb claimed to track down and find alien spherules on the ocean bottom. Here’s the sober truth.
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?
Galaxies don’t simply feed their central supermassive black holes, but the activity generated inside affects the entire galaxy and more.
Symmetries aren’t just about folding or rotating a piece of paper, but have a profound array of applications when it comes to physics.
Ground-based facilities enable the greatest scientific production in all of astronomy. The NSF needs to be ambitious, and it’s now or never.