The core mass of the giant exoplanet WASP-107b is much lower than what was thought necessary to build up the immense gas envelope surrounding giant planets like Jupiter and Saturn, astronomers at ...

Closer in, the gas forms a rotating, collapsing envelope, and finally, within a few hundred AU, settles into an accretion disk exhibiting Keplerian rotation. This entire progression resembles a ...

The moon's thin atmosphere, called an exosphere, has been a puzzle to science for some time. Two main processes were thought to create this wispy gas envelope; tiny meteoroids hitting the surface and ...

NASA’s Hubble Space Telescope has uncovered a witness at the scene of a star’s explosive death: a companion star previously hidden in the glare of its partner’s supernova. The discovery is a first for ...

NGC 7009, the Saturn Nebula, is an early-recognized planetary nebula named in the 1840s for its crude resemblance to Saturn, characterized by highly elongated equatorial projections known as ansae.