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

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 ...

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

United Launch Alliance’s Atlas V rocket returned to action Sunday with a mission to deploy multiple satellites into geosynchronous orbit for the National Reconnaissance Office and the US Space Force.

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 ...

Scientists have demonstrated a capability long sought by physicists: transmitting extremely precise time signals through the air between far-flung locations at powers that are compatible with future ...

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 ...

China's space program took a major stride this past week as two of its satellites seemingly docked together in what could have been the country's first high-altitude attempt at refueling a satellite ...