A famously unlucky date is getting a cosmic twist. NASA says the asteroid Apophis will safely pass close to Earth on Friday, ...

This occurrence will be the closest approach to Earth by an asteroid of this size that scientists have known about in advance ...

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).

It's been decades since humanity first sent a satellite into orbit, and during all this time we kind of become experts at it. What we still haven't mastered yet is extending the life of these ...

Space Operations Command has accepted Geosynchronous Space Situational Awareness Program (GSSAP) satellites 5 and 6 as operationally capable and has presented them to United States Space Command for ...

Last year, scientists drove up Mauna Loa volcano on Hawai’i, aimed a laser at a reflector positioned on Haleakala peak on Maui, and beamed rapid pulses of laser light through 150 kilometers of ...

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 ...

India’s advanced communication satellite, GSAT-8, launched on May 21, 2011 has reached Geosynchronous orbit with an orbital period of 23 hours 45 minutes. The satellite’s orbit has a perigee of 35,543 ...