An exoplanet in the Trappist star system — a multi-planet star system similar to the solar system and just 39 light-years ...

Mars’ strangely small mass still puzzles planetary scientists. Definitive answers as to why are still hard to come by.

A terrestrial planet has a solid rocky surface, with metals deep in its interior. In the solar system, these planets are closer to the sun and are therefore warmer than the planets located farther ...

Hurt (Caltech-IPAC) illustration Scientists say they've found the nearest temperate Earth-size world to date: Gliese 12 b, a so-called exo-Venus, meaning a rocky planet outside the solar system ...

The mysterious exoplanet TRAPPIST-1b, located in the TRAPPIST-1 system 40 light-years from Earth, has once again captivated ...

Scientists using the powerful James Webb Space Telescope sought to observe a planet beyond our solar system (an exoplanet) called Kepler-51d, an unusual "puffy" world with a cotton candy-like density.

The Webb Telescope reveals new insights into icy planetesimals, shedding light on the early solar system's evolution.

Test your knowledge on our solar system, from the biggest and smallest planets to the behemoth mountain on Mars. When you purchase through links on our site, we may earn an affiliate commission.

A massive interstellar object passing through our solar system during its formative ... object flyby could have had on rocky terrestrial planets like our own and Mars. “The scenario of a close ...