NASA's Mars InSight lander has measured and recorded for the first time ever a likely 'marsquake'. This is the first recorded trembling that appears to have come from inside the planet, as opposed to being caused by forces above the surface, such as wind. […]

Scientists have long known that Earth and Mercury have metallic cores. Like Earth, Mercury's outer core is composed of liquid metal, but there have only been hints that Mercury's innermost core is solid. Now, in a new study, scientists report evidence that Mercury's inner core is indeed solid and that it is very nearly the same size as Earth's solid inner core. […]

The Chelyabinsk meteor caused extensive ground damage and numerous injuries when it exploded on impact with Earth's atmosphere in 2013; to prevent another such impact, scientists plan to use a simple yet ingenious way to spot tiny near-Earth objects. […]

On its final flyby of Saturn's largest moon in 2017, NASA's Cassini spacecraft gathered radar data revealing that the small liquid lakes in Titan's northern hemisphere are surprisingly deep, perched atop hills and filled with methane. […]

Only a few years ago, the astronomy and heliophysics communities were skeptical about whether CubeSats could reliably obtain scientific data. But these breadloaf-size satellites have proven their ability to return useful data. […]

Astronomers have discovered a third planet in the Kepler-47 system, securing the system's title as the most interesting of the binary-star worlds. Using data from NASA's Kepler space telescope, a team of researchers detected the new Neptune-to-Saturn-size planet orbiting between two previously known planets. […]

Streams of meteoroids striking the Moon infuse the thin lunar atmosphere with a short-lived water vapor, according to researchers using data from NASA's LADEE spacecraft. The findings will help scientists understand the history of lunar water. […]

A nearby system hosts the first Earth-sized planet discovered by NASA's Transiting Exoplanets Survey Satellite, as well as a warm sub-Neptune-sized world. This milestone sets the path for finding smaller planets around even smaller stars, and those planets may potentially be habitable. […]

Astronomers have made a surprising discovery that gives clues to how solar system formed. […]

Newly published research reveals some interesting, surprising and reassuring data about how one human body adapted to -- and recovered from -- the extreme environment of space. […]