According to NASA, a low Earth orbit (singular) is any orbital trajectory that stays within 1,200 miles (2,000 kilometers) of Earth's surface. There's also a practical inner boundary to LEO space ...

GSSAP satellites are tasked with “neighborhood watch” surveillance in geosynchronous orbit, tracking objects and threats, but ...

The growing congestion of Earth orbit has raised risks to satellites, space stations, and long-term space sustainability. The ...

Airplane passengers crossing the Indian Ocean who peered out their windows on Oct. 19, 2024, might have seen what looked like a fast-moving star suddenly flash and fade. Above their heads, a $500 ...

A Long March 4C rocket lifts off from Xichang Satellite Launch Center, carrying Shiyan-28B (01) into orbit, July 3, 2025. Credit: Ourspace HELSINKI —A Chinese Shiyan satellite appears in a ...

The initial 21 satellites will begin the process of knitting together what's set to become a global "transport layer" for military communications.

Update: The launch has been postponed 24 hours to Wednesday, July 23, the Vandenberg Space Force Base announced. No reason was given for the delay. The next satellites SpaceX helps to deliver to orbit ...

Starlink is a satellite internet service operated by SpaceX, providing connectivity to millions, especially in remote areas. Thousands of Starlink satellites have been launched into orbit, ...

Two Chinese satellites have rendezvoused with one another more than 20,000 miles above the Earth in what analysts believe is the first high-altitude attempt at orbital refueling. China's Shijian-21 ...