If you had a clear western horizon, you had your shot at this view! On September 9, 2021, the Moon and Venus nearly overlapped. A simulated view of the post-sunset skies […]
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What do we mean by a black hole’s size? A photon sphere? The minimal stable orbit? The event horizon? The singularity? Which one is right?
Using image analysis tools developed for astronomy, researchers are predicting cancer therapy responses.
New studies find the interstellar comet 2I/Borisov is the most “pristine” ever discovered.
When we look at the night sky, we may see junk instead of stars.
Not nearly well enough. And we should all be concerned. In 1859, the science of solar physics truly began with the largest eruption in recorded history: the Carrington event. Prior […]
A new government report describes 144 sightings of unidentified aerial phenomena.
With radio and X-ray data combined, we’re understanding how energy flows like never before. When we look out at the Universe on the largest cosmic scales of all, gravity is the […]
Before there were planets, stars, and galaxies, before even neutral atoms or stable protons, there was the Big Bang. How did we prove it?
For many years, cosmologists have claimed the Universe is 13.8 billion years old. A new paper says no, it’s 26.7 billion. How do we decide?
The definitive answer requires better, unbiased data. Despite all the advances that have occurred in human history, one extraordinary puzzle still remains right in our own backyard: we aren’t sure how […]
The secret ingredient is violence, and it just might indicate that “moonmoons” aren’t as uncommon as most astronomers think.
Finding out how the Universe grew up was the biggest science goal of JWST. This ultra-early proto-galaxy cluster is one amazing discovery.
Despite all the challenges, Hubble has vindicated this discovery. Practically everywhere we look in the Universe, the large-scale objects that we see — small galaxies, large galaxies, groups and clusters of galaxies, […]
Even with six months’ notice, we can’t stop an incoming asteroid.
See the most detailed survey of the southern sky ever carried out using radio waves.
Centuries ago, the plague forced people into quarantine for years. Isaac Newton and Galileo used the time to revolutionize the world.
A far-ranging conversation about telescopes, what they do, and who they impact. When most of us think of astronomy, we think about two types of scientists: the observers who point their […]
You’re gonna die, cloud! All stars, even our Sun, will someday eventually die. After burning on the main sequence for billions of years, the Sun will expand into a red giant, […]
A unique exoplanet without clouds or haze was found by astrophysicists from Harvard and Smithsonian.
Betelgeuse, the tenth brightest star in the night sky, mysteriously dimmed last year. Now researchers know why.
Speeding through the Universe and leaving a wake of new stars, this runaway supermassive black hole is likely the first among thousands.
All across the Universe, planets come in a wide variety of sizes, masses, compositions, and temperatures. And most have rain and snow.
From succubi to aliens, stories of abductions or other unsettling encounters have been with us for millennia. What explains them?
We just observed the first ‘lunar formation’ in an exoplanetary system. This one image, above, is the first to show moons actively forming around a planet. This colourful image shows […]
65 million years ago, a massive asteroid struck Earth. Not only did Jupiter not stop it, but it probably caused the impact itself.
The zero-point energy of empty space is not zero. Even with all the physics we know, we have no idea how to calculate what it ought to be.
If stars don’t go supernova at first, they can get a second chance after becoming a white dwarf. But can their companions survive?
Determining if the universe is infinite pushes the limits of our knowledge.
Dark energy is one of the biggest mysteries in all the Universe. Is there some way to avoid “having to live with it?”