The terms asteroid, meteor, meteorite and even comet are often used interchangeably...but what is the difference?
New research suggests collisions between moonlets created the oddly-formed objects
Despite a long-standing international ban, ozone-destroying chlorofluorocarbons are surging back into Earth’s atmosphere from unknown sources
After a clutch of historic detections, gravitational-wave researchers have set their sights on some ambitious scientific quarry
The Queqiao orbiter will serve as a vital communications relay between the Earth and future lunar landers—and perform some science, too
The three-kilometer-wide object is near Jupiter; future spacecraft could visit if its status is confirmed
Our closest star has a much more exciting biography than scientists once assumed. New research illuminates the sun's past and potential future
A disagreement between two canonical measures of intergalactic distances could signal a renaissance in physics—or deep flaws in our studies of cosmic evolution
A new reactor design could make nuclear-powered space exploration cheap, reliable and safe
The autonomous rotorcraft will fly to the Red Planet with the Mars 2020 rover
Archived observations from NASA’s Galileo spacecraft all but confirm the Jovian moon’s subsurface ocean is within reach of future life-seeking missions
Astronomers have proposed a way of finding mountains, oceans and volcanoes on distant planets that are much too small to observe directly
Scientists are considering whether AI could help us search for alien intelligence in ways we haven’t even thought of yet
Sediment records have confirmed that Jupiter and Venus change Earth's orbit from virtually circular to noticeably elliptical and back every 405,000 years. Christopher Intagliata reports.
Astronomers' newfound ability to see the same cosmic events in light, particles and gravitational waves—a synthesis called multimessenger astronomy—gives them a fuller picture of some of the universe's most mysterious phenomena
A new study validates the feasibility of constructing gossamer-thin light sails for propelling spacecraft to other stars
Astronomers have found more than 3700 worlds outside of our solar system in the past 25 years. How do they find them?
Stars traveling more than 1,200 kilometers per second hint at a new mechanism behind cosmos-spanning stellar explosions
The InSight Mission will look at Mars's seismic activity and latent heat to find out more about how planets get made--and how humans might live there.