The most unique interloper into our Solar System has a natural explanation that fits perfectly — no aliens required.
Based on the atoms that they're made out of, the innermost planet should always be the densest. Here's why Earth beats Mercury, hands down.
Think there are habitable super-Earths out there? Think again. Here in our Solar System, we have two very distinct types of planets: small, terrestrial, rocky worlds, with thin (or no) atmospheres […]
If a large asteroid strikes Earth, it has the potential to release an enormous amount of energy, leading to local or even global catastrophes. The strike that led to the […]
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 […]
Astronomers possibly solve the mystery of how the enormous Oort cloud, with over 100 billion comet-like objects, was formed.
The meteorites suggest astronomers may have small, early planets wrong.
On the morning of June 30, 1908, an explosion of more than 10 megatons occurred above the sparsely populated Siberian Taiga. What caused the so-called Tunguska event?
Debris from Pluto-sized collisions, not aliens, are streaming through the galaxy. In 2017, scientists discovered an object passing through our Solar System that was unlike anything else we had ever seen. […]
While Mars is known as a frozen, red planet today, it has all the evidence we could ask for of a watery past, lasting for approximately the first 1.5 billion […]
In the largest star-forming region close to Earth, JWST found hundreds of planetary-mass objects. How do these free-floating planets form?
Since the time of Galileo, Saturn's rings have remained an unexplained mystery. A new idea may have finally solved the longstanding puzzle.
If dark energy gets stronger with time, our fate could be an utter catastrophe. When it comes to the entire Universe, one of the biggest existential questions we’re capable of […]
The Sun will eventually become a red giant star, swallowing Mercury and Venus in the process. But what will happen to Earth? There are a few existential questions we can ask […]
There’s more light than we can account for, and we’ve just measured it robustly for the first time. When we look out at the darkest night skies available on Earth, even […]
Science can teach us so much about our planet, but something more must compel us to take care of it. If you want to understand our planet, the best way to […]
We’re not made out of the densest elements, but we’re the densest planet nonetheless. Here’s why. Of all the planets, dwarf planets, moons, asteroids and more in the Solar System, only […]
Could 16 Psyche make every person on Earth a billionaire? The space mining race is heating up.
It peaks the nights of August 11–13, but it’s no longer the year’s most reliable meteor shower. Every year, beginning in mid-July, planet Earth commences passing through an enormous debris […]
With launch costs dropping and enormous numbers of new satellites filling the sky, can't we just do it all from space?
Avi Loeb says it’s aliens. Every other astronomer disagrees. Here’s why. In 2017, an astronomical event occurred that was unlike any other: for the first time, we observed an object that […]
In 2006, Pluto was demoted in a very controversial decision. Unless you ignore nearly all of planetary science, it'll never be one again.
Finding alien technology on the seafloor would be truly incredible. This extraordinary claim, however, is debunked by the actual evidence.