Way up in the sky and sprinkled across the seas, two of the littlest yet most influential things in the world have stubbornly guarded their secrets: aerosols and phytoplankton. Today, NASA launched its Plankton, Aerosol, Cloud, Ocean Ecosystem mission, or PACE, to unravel their mysteries. The mission’s findings could be a key to understanding how

Voyager 1 is still alive out there, barreling into the cosmos more than 15 billion miles away. However, a computer problem has kept the mission’s loyal support team in Southern California from knowing much more about the status of one of NASA’s longest-lived spacecraft. The computer glitch cropped up on November 14, and it affected

In the beginning there was only one. It looked like an aluminum beach ball with four car antennas sticking out. Stuffed with radio transmitters, history’s first human-made satellite emitted a spectral beeping signal from its solitary orbit for just three weeks before its batteries died. That was enough to terrify the world. The Soviet Union’s

Extreme heat kills roughly half a million people worldwide each year, but at the current rate of global warming it could be close to five times as deadly by 2050. Then there are the indirect health risks of climate change: Chaotic weather and higher temperatures generate deadly natural disasters, bring diseases into new areas, and