A proposed new definition for what constitutes a "planet" could reinstate the demoted icy world
A baker’s half-dozen of Earth-size worlds is orbiting a (relatively) nearby star—and some could be habitable
Astronomers say at least three of the worlds may be habitable, and could be studied for signs of life within a decade
Jupiter’s ocean-bearing moon is the next frontier in NASA’s hunt for extraterrestrials
Astronauts’ gray matter is compressed by time in space—except in an area that controls feeling and movement in the legs. Karen Hopkin reports.
New studies suggest lonely planets flying through intergalactic space were formed by star-destroying supermassive black holes.
NASA's work on climate change would go to another agency, with or without funding, or possibly get cut
Astrophysicist and author Mario Livio writes in the journal Nature and talks to Scientific American about the recently rediscovered essay by Winston Churchill that analyzed with impressive scientific accuracy the conditions under which extraterrestrial life might exist.
In 1939, he wrote presciently about the possibilities of extraterrestrial life in a way modern scientists can admire
Images of an exploding dying star taken just a few hours after its detonation are revealing new details of stellar death
After intense debate, planetary scientists have selected three finalist landing sites for an ambitious U.S. mission that will set the course for future Mars exploration
The newfound structures in disks of dust and gas around newborn stars could aid planet formation
The gas giant planet took shape within 4 million years of our solar system's formation
Observers across parts of North America can watch a full snow moon penumbral lunar eclipse on February 10, 2017
Nobel laureate Robert Wilson discusses how a network of telescopes might illumine a black hole, after the 92nd Street Y’s Bang! Bang! event.
The discovery brings the number of known "intermediate-mass" black holes to about a dozen
Radioactive glass from the Trinity nuclear test site resembles ancient moon rocks
It missed the historic discovery, but the Virgo lab in Italy is now primed to extend LIGO’s reach and precision
New data from NASA's Curiosity rover suggest a surprising dearth of greenhouse gases in the Red Planet's distant past
A trio of x-ray observatories has spied a supermassive black hole feasting on a giant star for more than a decade