WASHINGTON — United Launch Alliance plans to begin 2026 with a national security mission as its Vulcan Centaur rocket ...

Geosynchronous orbits are vital for communications and Earth-monitoring satellites. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A ...

Amateur radio operators like to say that working a contact in space can be done with a simple handheld transceiver and a homemade antenna. And while that’s true, it’s true only for low Earth orbit ...

A small asteroid came within a cosmic hairbreadth of the ring of communications satellites circling the Earth in geosynchronous orbit this week. Passing by our planet at an altitude of about 35,000 km ...

A Long March 3B lifts off from Xichang, sending Shijian-25 on its way to orbit, Jan. 6, 2025. Credit: Ourspace HELSINKI — China’s experimental Shijian-21 and Shijian-25 satellites have separated in ...

Early this evening in Florida, space transport company SpaceX successfully launched its Falcon 9 rocket on a trajectory to place a satellite in geosynchronous orbit. The success comes on the third ...

An artist's rendition of DARPA's RSGS robotic payload on board SpaceLogistics' Mission Robotic Vehicle. (Northrop Grumman) SpaceLogistics will work with DARPA to develop a robotic servicing spacecraft ...

Last Saturday (March 15) a Russian Proton Breeze-M launch vehicle failed to place the AMC-14 satellite into geosynchronous orbit. SES Americom, operator of the satellite, confirmed that “an anomaly ...

Geosynchronous Synthetic Aperture Radar (GEO SAR) systems represent a promising frontier in Earth observation technology, offering continuous monitoring of specified regions with exceptionally short ...

During the Cold War the U.S. and Soviet Union had a gentlemen's agreement to avoid targeting one another's geostationary satellites, which are crucial for weather forecasts, satellite TV, global ...

A geosynchronous orbit is a geocentric orbit that has the same orbital period as the sidereal rotation period of the Earth. It has a semi-major axis of 42,164 km (26,200 miles). In the special case of ...