A geosynchronous orbit (sometimes abbreviated GSO) is an Earth-centered orbit with an orbital period that matches Earth's rotation on its axis, 23 hours, 56 minutes, and 4 seconds (one sidereal day).

Elon Musk's SpaceX is set to launch a Falcon 9 rocket from Cape Canaveral, Florida. Here are best places to watch liftoff and what time to stream it.

Reports suggest that the US Space Force is pausing missions on the Vulcan rocket until an anomaly observed during a February ...

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 ...

Under the new GHOST-R effort, the Defense Innovation Unit hopes to have a high-resolution bird operating on orbit within 24 months.

HELSINKI — China appears to have considered boosting its space situational awareness capabilities by placing a satellite in a retrograde orbit out at the geostationary belt. A paper published in ...

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 ...