Summer sea ice could vanish later this decade, with disastrous consequences. It all depends on the physics of ice.
Astronomers will soon take their first glance at the atmosphere of a distant exoplanet. Sarah Hörst is writing the guidebook for these exoplanetary explorers, one that will reveal what a distinctive atmosphere says about the world underneath.
Astronomers couldn’t find enough satellite galaxies orbiting the Milky Way. Now they have the opposite problem.
Quasars powered by supermassive black holes have been unexpectedly vanishing. Scientists have started to figure out why.
Rosaly Lopes has visited dozens of active volcanoes on Earth and discovered even more elsewhere in the solar system. Her work is helping to establish whether volcanoes on distant moons could create conditions friendly to life.
Astronomers argue that there’s an undiscovered giant planet far beyond the orbit of Neptune. A newly discovered rocky body has added evidence to the circumstantial case for it.