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The James Webb Space Telescope viewed Neptune, our Solar System's final planet, for the first time. Here's what we saw, and what it means.

The outer planets' clouds hide the weirdness within.

Scientists may have detected the somewhat smelly chemical dimethyl sulfide on a planet 120 light-years from Earth.

Back in 1990, we hadn't discovered a single planet outside of our Solar System. Here are 10 facts that would've surprised every astronomer.

They're the most common type of exoplanet known today, and many astronomers have called them "super-habitable." None of that is true.

Exoplanet LP 791-18d is likely to have an atmosphere and liquid water.

Do you think you know the Solar System? Here's a fact about each planet that might surprise you when you see it!

Since the time of Galileo, Saturn's rings have remained an unexplained mystery. A new idea may have finally solved the longstanding puzzle.

The story of how Jupiter, Saturn, Uranus and Neptune were made isn't a universal one. Some gas giants were built different.

Gravitation, all on its own, can reveal what's present in the cosmos like nothing else.

While Saturn and its moons all appear faint and cloudy to JWST, Saturn's rings are the star of the show. Here's the big scientific reason.

In terms of the planets we've discovered, super-Earths are by far the most common. What does that mean for the Universe?

What kind of object will you form? What will its fate be? How long will a star live? Almost everything is determined by mass alone.

Human beings are tiny creatures compared to the 92 billion light-year wide observable Universe. How can we comprehend such large scales?

With its first view of a protoplanetary disk around a newly forming star, the JWST reveals how alone individual stellar systems truly are.

There are 40 billion billion black holes in the universe. Here’s how our Solar System stacks up against ten of them.

We've only seen Uranus up close once: from Voyager 2, back in 1986. The next time we do it, its features will look entirely different.

Get ready for the most peculiar road trip that will help you understand the vastness and emptiness of the solar system — and Sweden.

Individual space telescopes, like Hubble and JWST, revolutionized our knowledge of the Universe. What if we had an array of them, instead?

No planet enters retrograde more frequently than Mercury, which does so 3-4 times each year. Here’s the scientific explanation for why.

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!

This oddball system of three stars might be our best chance at finding nearby life in the Universe.

We have long thought that Pluto was completely frozen solid, but the discovery of cryovolcanoes challenges that assumption.

Neptune holds records in our Solar System, but the Universe gets even faster. Here on Earth, extreme weather events can cause dramatic wind speed spikes. When hurricanes are at their most […]

Binary black holes eventually inspiral and merge. That's why the OJ 287 system is destined for the most energetic event in history.

Planets are either rocky, like Earth, or gas-rich, like Neptune, with no in-between. What are the different types of planets that exist in the Universe? If all you could see […]

In 1990, we only knew of the planets in our own Solar System. Today, the exoplanet count is more than 5000. Here's what we've learned.

The secret ingredient is violence, and it just might indicate that "moonmoons" aren't as uncommon as most astronomers think.

In 2006, Pluto was demoted in a very controversial decision. Unless you ignore nearly all of planetary science, it'll never be one again.

The nearby, bright star Fomalhaut had the first optically imaged planetary candidate. Using JWST's eyes, astronomers found so much more.