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From size to mass to density and more, each world in our Solar System is unique. When we compare them, the results are truly shocking.

As planets with too many volatiles and too little mass orbit their parent stars, their atmospheres photoevaporate, spelling doom for some.

Adams was infamously scooped when Neptune was discovered in 1846. His failure wasn’t the end, but a prelude to a world-changing discovery.

Planets can be Earth-like or Neptune-like, but only rarely are in between. This hot, Saturn-like planet hints at a solution to this puzzle.

Out beyond Neptune are some fascinating bodies left over from our Solar System’s formation. Could one of them truly be spectacular?

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

The outer planets’ clouds hide the weirdness within.

The Universe, although violent, is filled with creation events following destructive ones. 1850 light-years away, both types are unfolding.

Explore how the study of exoplanets is transforming our understanding of ocean formation.

The 5th brightest star in our night sky is young, blue, and apparently devoid of massive planets. New JWST observations deepen the mystery.

The structure of our Solar System has been known for centuries. When we finally started finding exoplanets, they surprised everyone.

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.

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

For now, our Solar System’s eight planets are all safe, and relatively stable. Billions of years from now, everything will be different.

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

From the coldest planets to spacecraft that have exited the Solar System, these little-known facts stump even many professional astronomers.

Recent controversies bode ill for the effort to detect life on other planets by analyzing the gases in their atmospheres.

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.

Within the next few decades, we may well have hard evidence for the existence of alien life on worlds light-years distant from Earth.

The detection of two celestial interlopers careening through our solar system has scientists eagerly anticipating more.

Some fascinating observations of K2-18b have come along with horrendous, speculative communications. There’s no evidence for oceans or life.

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.

Astronomers have discovered more than 5,000 confirmed exoplanets — very few of which resemble Earth.

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

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

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

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

Newborn stars are surrounded only by a featureless disk. Debris disks persist for hundreds of millions of years. So when do planets form?

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.

All the stars, stellar corpses, planets, and other large, massive objects take on spherical or spheroidal shapes. Why is that universal?