Xenon measured by the European Space Agency's Rosetta spacecraft has shed light on a long-standing mystery about the role comets played in Earth's formation.
Mars was once far wetter than it is now — but just how much rain fell, and when?
Astronomers have more evidence that the hidden ocean inside Saturn’s moon Enceladus is heated by hydrothermal activity.
NASA’s MAVEN mission has confirmed that the solar wind stripped the Red Planet of its atmosphere.
The star with seven exoplanets puts out enough high-energy radiation to tear away the inner planets’ atmospheres in a few billion years.
Astronomers have found seven Earth-sized planets around a cool red dwarf, all of which have the potential for liquid surface water.
The Dawn spacecraft has detected organic compounds on the dwarf planet Ceres.
Astronomers suspect the Sun’s closest stellar neighbor desiccated its potentially rocky exoplanet, destroying the planet’s chances for habitability.
From the discovery of gravitational waves to the building evidence that a massive planet could exist beyond Pluto, it has been a thrilling year for astronomy research. We recap.
Curiosity scientists have tracked Gale Crater’s changing environment as it became more, then less, acidic over millions of years. Microbial life could have survived in these conditions.
Observations confirm that the closest star to our solar system has a regular magnetic cycle similar to our Sun.
The discovery of a chiral molecule in space has the potential to sort out one of the biggest mysteries in the chemistry of life.
NASA’s Mars orbiter MAVEN has painted a detailed picture of how the solar wind robs the Red Planet of its atmosphere.
On October 28th, the Cassini spacecraft took its deepest dive through the water plume spewing from the south pole of Saturn’s moon Enceladus. It passed only 30 miles (50 kilometers) above the icy surface.
The Kepler spacecraft recorded a bunch of irregular dimmings around one of its target stars, designated KIC 8462852. No natural phenomenon explains the dips well.
Scientists have confirmed that water-soaked salts likely create dark seasonal lines on Mars.
A $100 million donation will radically speed up the search for artificial signals from the nearest million stars — and from trillions of much farther stars in the 100 nearest galaxies.
Scientists have detected glass in Martian craters, created by the fierce heat of impacts that melted the Red Planet’s surface.
This year’s April Fools' provides a wealth of alarming results. Catch up on all the scientific shenanigans here.
A new map of Beta Pictoris reveals an asymmetric clump of carbon monoxide likely produced in cometary collisions. It provides a rare glimpse at the chaotic birth of a planetary system.
A new analysis of data from spacecraft orbiting the Red Planet suggests that gigantic calderas lie disguised on the planet’s surface. If the features are volcanoes, they could help explain the mysterious, fine-grain debris that coats Mars.
For 40 years astrobiologists have wrestled with how to make the early Earth warm enough to support life even though the young Sun was at least 30% fainter than it is now. New climate models, powered by supercomputers, are converging on a solution.
The results from the Curiosity rover's first rock-drilling are in: the rock formed in the presence of fairly neutral, not-too-salty water and has a chemical makeup that might have provided energy for microorganisms.
Astronomers had thought that ice on the Saturnian moon's methane-ethane seas would sink. But a new study suggests that, if the right conditions are met, ice could actually float on this alien-Earth world.
NASA's Kepler space observatory is finally achieving its goal of finding many Earth-size exoplanets with surface temperatures suitable for liquid water — and thus potentially habitable.