We're getting closer and closer to finding a real Earth-like exoplanet. But finding one is only half the battle. To truly know if we're looking at an Earth analog somewhere else in the galaxy, we have ...

Exoplanets aren't the only objects floating around other stars—they likely have comets and asteroids as well. Even some of the exoplanets themselves will have "exomoons," at least according to our ...

We use astrometry of Pluto and other TNOs to constrain the sky location, distance, and mass of the possible additional planet (Planet Nine) hypothesized by Batygin and Brown (2016). We find that over ...