SUNSET: 
Milestone: Astronomers Discover Water Vapor on a Super-Earth
Two independent teams of astronomers have discovered the signature of water vapor in the atmosphere of super-Earth K2-18b.
60-Second Astro News: Helium Exoplanets and a Supernova Surprise
This week in astronomy news: Inflated helium atmospheres surround two exoplanets, and the Kepler Space Telescope captures the moments around a supernova that hint at a companion star triggering the explosion.
An Atmosphere of Heavy Metals
Researchers have found strong evidence of titanium oxide in the atmosphere of a hot giant planet, adding new insights to the complex motions of these planets’ extreme atmospheres.
Do Atmospheres Spin Worlds to Habitability?
The best place to look for nearby Earth-size planets are around the smallest, coolest stars. New research shows that any exoplanets tightly circling their stars might have a better chance of being habitable than previously thought.
Titan Sheds Light on Alien Atmospheres
Saturn’s largest moon Titan played a cameo as an exoplanet, allowing astronomers to better understand how a thick layer of haze or clouds might affect their observations of more distant alien worlds.