Thanks to the discovery of thousands of exoplanets to date, we know that planets bigger than Earth but smaller than Neptune ...

New research tracks young planets around a nearby star, showing how large, gas-rich worlds shrink over time to become the most common planets in the galaxy ...

Right angle Illustration of 2M1510 showing the orbits of the two brown dwarfs (in blue) and that of the planet (in orange). (Courtesy: ESO/L Calçada) The first strong evidence for an exoplanet with an ...

Most planetary systems contain worlds larger than Earth but smaller than Neptune, and the low-density planets around one ...

A newly discovered exoplanet is rewriting the rules of what planets can be. Orbiting a city-sized neutron star, this ...

An illustration depicts what the surface of one of the exoplanets orbiting Barnard's Star may look like. The other three planets within the system can also be seen. - International Gemini ...

A planet circling at a sharp 90-degree angle to the orbits of its two host stars has now been confirmed. This discovery challenges long-standing ideas about how planets form and orbit in the cosmos.

It was almost 100 years ago that Clyde W. Tombaugh discovered Pluto. That was the last planet found until 1992, when humans found another one. But this new planet wasn't in our solar system—it was ...

In the cold, dark outskirts of planetary systems far beyond the reach of the known planets, mysterious gas giants and planetary masses silently orbit their stars — sometimes thousands of astronomical ...

New simulations examine whether the seven planets in the TRAPPIST-1 system could host moons, showing that only small, close-orbiting moons could remain stable over long periods ...

Mercury has long baffled astronomers because it defies much of what we know about planet formation. A new space mission ...