Stories by SPACE.com

Kepler-138b is the first world smaller than Earth to have its size and mass measured

The ALMA telescope array glimpses a far-distant galaxy through an Einstein ring

New research shows that Saturn's outermost ring, discovered in 2009, is far larger than previously thought

NASA's huge supersonic parachute isn't ready to land astronauts on Mars just yet

This 'cathedral' to the U.S. space race, dormant for 23 years, will be restored in time to commemorate the first moon landing's half-century anniversary

The spacecraft will not revisit the battered, porous moon before its mission concludes in 2017

Ed White’s first foray into the vacuum of space on June 3, 1965, set the stage for future spacewalks to assemble stations and repair telescopes

Two volcanic islands that were recently born in the Red Sea are providing scientists with new information about a rift in Earth's crust

Explosive geysers of material that shoot away from black holes at nearly the speed of light seem to form more often in galaxies that are the product of two galaxies merging together

Astronomers worldwide are focusing on Pluto, in anticipation of a July 14 flyby of the dwarf planet by NASA's New Horizons probe 

Called npj Microgravity, the open-access journal will highlight scientific advances in various fields that are facilitated by spaceflight

Most details about the space plane are classified, but the launch vehicle also carried 10 miniscule "cubesats," including the LightSail solar sail, developed by the Planetary Society

The cargo vessel burned up over the Pacific Ocean around 10 p.m. EDT on Thursday

"She was a constant shining smile over the years every time our paths crossed," tweeted her co-star William Shatner (Captain Kirk)

Drastic temperature variations observed on 55 Cancri e suggest the exoplanet is geologically active

The suborbital "New Shepard" spacecraft reached an altitude of more than 93 kilometers in its inaugural flight

A Progress robotic delivery spacecraft that launched toward the International Space Station suffered a serious malfunction shortly after liftoff

The uncrewed ship malfunctioned shortly after launching on a mission to the International Space Station. Ground controllers are working to salvage the mission

The daring reusable rocket landing test now is set for 4:10 pm Eastern today

The darkest part of Earth's shadow will fall across the lunar surface, producing a "blood moon"

The mission will help NASA understand how the body could handle a trip to Mars 

The next March equinox eclipse won't occur for another 19 years

Unless you live in the North Atlantic or Arctic region, the Internet is the best place to watch this event 

The ocean there is thought to extend to 10 times the depth of Earth's oceans