A Mysterious Startup Is Developing a New Form of Solar Geoengineering
Stardust, an Israeli–US startup, intends to patent its unique aerosol technology for temporarily cooling the planet.
Protest Is Risky at Egypt’s COP27. That Won’t Stop Activists
At the international climate summit in Sharm el-Sheikh, long-standing restrictions on protesters and dissidents are front and center.
The Tiangong Space Station Makes China a Major Space Power
With the station's completion, the country now has a long-term platform in orbit.
Researchers Made Ultracold Quantum Bubbles on the Space Station
NASA’s Cold Atom Laboratory runs super-low-temperature experiments in near-zero gravity that would be impossible to accomplish on Earth.
How to Deal With Rocket Boosters and Other Giant Space Garbage
As an errant SpaceX rocket booster careens toward the moon, here are some of the ways space agencies and companies are trying to deal with huge pieces of debris.
‘Oumuamua Was Neither Comet nor Asteroid…So What Was It?
Last year's brief interstellar visit from a cigar-shaped thing named 'Oumuamua is confounding astronomers in new ways.
This Galactic Collision Shaped the History of the Milky Way
Astronomers have found stars dating from a long-ago collision between the Milky Way and another galaxy. The crash helps to explain why the Milky Way looks the way it does.
Trump’s ‘America First’ Policies Won’t Work in Space
Opinion: The president's National Space Council should prioritize diplomacy.