We have long thought that Pluto was completely frozen solid, but the discovery of cryovolcanoes challenges that assumption.
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Pluto failed to meet the definition of a planet, but some astronomers think there might be a legitimate Planet 9 out there.
Mercury, Venus, and Mars are all uni-plate planets, and may always have been. Here's what's known about why Earth, uniquely, has plate tectonics.
In 2006, Pluto was demoted in a very controversial decision. Unless you ignore nearly all of planetary science, it'll never be one again.
In all of human history, only 5 spacecraft have had the right trajectory to exit the Solar System. Will they ever catch Voyager 1?
Do you think you know the Solar System? Here's a fact about each planet that might surprise you when you see it!
In a distant galaxy, a cosmic dance between two supermassive black holes emits periodic flashes of light.
An army of replicators belonging to national laboratories, research universities, and amateur garages is rushing to replicate ambient superconductivity in LK-99.
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. […]
Compared to Earth, Mars is small, cold, dry, and lifeless. But 3.4 billion years ago, a killer asteroid caused a Martian megatsunami.
Coherentism accepts that circular reasoning is probably the best any of us can do.
All across the Universe, planets come in a wide variety of sizes, masses, compositions, and temperatures. And most have rain and snow.
The nearby, bright star Fomalhaut had the first optically imaged planetary candidate. Using JWST's eyes, astronomers found so much more.
In 2006, the IAU demoted Pluto. Here’s what we know today. In 2006, the last planet in our Solar System suffered an unforgettable insult, as Pluto — known for generations as our ninth […]
The length of a day oscillates slightly every six years. This was a surprising discovery made last decade. We might now know why.
What if intelligence can thrive without consciousness?
A new study shows that the Bernardinelli-Bernstein Comet is much larger than previously thought — potentially the largest ever spotted.
The most unique interloper into our Solar System has a natural explanation that fits perfectly — no aliens required.
Can two planets stably share the same orbit? Conventional wisdom says no, but a look at Saturn's moons might tell a different story.
From here on Earth, looking farther away in space means looking farther back in time. So what are distant Earth-watchers seeing right now?
The stars, planets, and many moons are extremely round. Why don't they take other shapes?
Get ready for the most peculiar road trip that will help you understand the vastness and emptiness of the solar system — and Sweden.
Water is vital for life. Luckily for spacefaring humans, the solar system is full of it.
Scientists find an exoplanet whose strange behavior may lead to the Solar's System hidden ninth planet.
The largest moon around our last planet didn’t originate with Neptune. When it comes to the moons of our Solar System, there’s only one planet that doesn’t fit in with our […]
Astronomers possibly solve the mystery of how the enormous Oort cloud, with over 100 billion comet-like objects, was formed.
The 1998 hit is making a comeback. Stop what you're doing and watch the original.
Empty, intergalactic space is just 2.725 K: not even three degrees above absolute zero. But the Boomerang Nebula is even colder.
The view from beyond Pluto is far enough from Earth that we can see the stars shift. NASA’s New Horizons, humanity’s first spacecraft to encounter Pluto, is more than 4.3 billion […]