The discovery of a dizzying variety of planets and planetary systems is prompting a wholesale re-evaluation of what it takes for a planet to be habitable.

Images collected during Cassini's superclose orbits in 2017 are giving scientists new insight into the complex workings of the rings.

After nearly 16 years of exploring the cosmos in infrared light, NASA's Spitzer Space Telescope will be switched off permanently on Jan. 30, 2020.

The forecast for the next solar cycle says it will be the weakest of the last 200 years.

Scientists have discovered that the yellow color seen on the surface of Jupiter's moon Europa is actually sodium chloride, a compound known on Earth as table salt.

The next robotic Mars mission will carry technology that will help enable astronauts to eventually explore the Red Planet.

Scientists have solved the mystery of how Ceres’ gigantic volcanic dome, Ahuna Mons, was formed.

Designed to explore a metal asteroid that could be the heart of a planet, the Psyche mission is readying for a 2022 launch.

To hunt for exoplanets, the flowerlike shade would need to stay aligned with a space telescope over vast distances. Recent work demonstrates how that's possible.

NASA is gearing up for a test of the system that will help keep astronauts safe when traveling to the Moon aboard agency’s Orion spacecraft.

NASA's Mars Helicopter flight demonstration project has passed a number of key tests with flying colors.

Scientists and engineers have a new plan for getting NASA InSight's heat probe, also known as the "mole," digging again on Mars.