SUNSET: 
Are Moons Growing Around Exoplanet PDS 70c?
New research suggests that the circumplanetary disk surrounding the exoplanet PDS 70c contains a ring of dense dust, and the conditions within this ring may allow baby moons to form.
Exoplanet or Exomoon? New Contender Elicits Skepticism
Astronomers have found a Jupiter-mass world orbiting a brown dwarf that orbits a star.
First Atmosphere Detected on a Terrestrial World
A team of astronomers have discovered helium escaping from a rocky planet, marking the first detection of an atmosphere on a rocky world.
Famous System Has a Third Planet: Beta Pictoris d
Two teams of astronomers independently discovered a third giant gas planet orbiting in the famous Beta Pictoris system.
"Rogue" Neptunes Are Detached But Not Alone
"Rogue" Neptune-size worlds might not roam the galaxy totally on their own, just very far away from their parent stars.
Cotton-Candy Exoplanets: Two for the Price of One!
NASA’s Transiting Exoplanet Survey Satellite has found two “super-puff” planets in the same system, each one as light as cotton candy.
How Did This Peculiar Planet Pair Form?
A planetary odd couple — a mini-Neptune and a hot Jupiter — probably formed much farther away from their star before migrating closer in.
Nearby Super-Earth Has No Atmosphere and a Dark, Moon-like Surface
The James Webb Space Telescope has observed the surface of a bare rocky exoplanet, revealing old, dark rock akin to that on our Moon.
Planets Collide Around Young, Sun-like Star
Astronomers have uncovered evidence that two planets collided around a young star, revealing how giant impacts sculpt baby solar systems.
New Astro Images: Saturn, the Crab Nebula, and a Newborn Planet
Striking images from Hubble, Webb, and the Very Large Telescope dive into Saturn's atmosphere, capture the Crab Nebula's expansion, and reveal a newborn planet.
Molten Sulfurous World Blurs Exoplanet Categories
An oddly low-density planet isn't quite rocky or gaseous — instead, it might have a deep ocean of magma and a stinky, sulfurous atmosphere.
A Planetary System That Breaks the Rules
The unexpected arrangement of exoplanets around a star more than 100 light-years from Earth might change how we think about planet formation.
Astronomers Find Hints of an Exomoon
Astronomers might have found a moon half the mass of Jupiter orbiting in a nearby system, based on the wobbles of its host world.
Rogue Saturn Discovered Floating Through the Milky Way
Astronomers have measured the mass of a free-floating planet for the first time. Comparable to Saturn, it’s surprisingly massive for such rogue worlds.
Webb’s First Look at TRAPPIST-1e Hints at a Titan-like Atmosphere
Observations from the James Webb Space Telescope suggest the planet might have a nitrogen-and-methane atmosphere — but more data are needed to rule out a bare rock scenario.
A Super-Earth Candidate Less Than 20 Light-Years Away
Astronomers have discovered a ready-to-image super-Earth candidate less than 20 light-years away.
Rogue World Found Gobbling Material at Unprecedented Rate
Astronomers discovered a small, free-floating object that’s accreting matter at a breakneck pace, suggesting that some planet-size worlds could form similar to stars.
Water Worlds Might Be Few and Far Between
Primordial chemistry might destroy most of the water on sub-Neptunes; if so, there could be far fewer “water worlds” than previously thought.
Baby Planet Clears Gap in Young Protoplanetary Disk
With the Very Large Telescope in Chile, astronomers have spotted a planet forming around a star 430 light-years away.
No Evidence for Atmosphere on Trappist-1d
New James Webb Space Telescope observations of the third world in the seven-planet TRAPPIST-1 system rule out a variety of atmospheres.
