satellites

Private companies like SpaceX are crowding Earth's atmosphere with ever-increasing numbers of satellite 'megaconstellations'. For astronomers, the toll of these bright, ubiquitous objects is already painfully clear.

When a satellite runs out of fuel, it becomes little more than space junk. Now, space agencies and private companies want to change that. Here's how scientists plan to refuel satellites — in orbit.

A communications glitch is preventing NASA's Voyager 1 probe — the farthest spacecraft from Earth in history — from sending home data, and mission scientists are growing concerned.

The uncontrolled reentry of Europe's defunct ERS-2 satellite is expected in mid-February. It's highly likely that the 5,000-pound craft will land somewhere in the ocean.

NASA has successfully transmitted data between Earth and two spacecraft using lasers, completing a groundbreaking experiment that could aid in future missions to other worlds.

A research plane that flew through Earth's stratosphere identified more than 20 elements that are linked to the aerospace industry. Experts predict that the problem could become much worse in the future.

The NOAA satellites GOES-East and GOES-West watched as the shadow of the moon darkened the surface of Earth on Saturday, Oct. 14.

New research finds that SpaceX's Starlink satellites are leaking radiation that could interfere with radio astronomy.

The sun is quickly approaching a major peak in solar activity. Experts warn it could potentially begin by the end of 2023, years before initial predictions suggested.