The next-generation vehicle was inadvertently picked up on satellite images at the Port Hueneme naval base in California.
The phenomenon, which looks like someone has punched holes in the cloud cover, had puzzled scientists for decades.
There is evidence to suggest that the satellite - named Kosmos-2558 - is tailing a confidential US satellite.
The image of an alleged Bigfoot found on Google's satellite mapping service has been dividing opinion this week.
The space rock passed us by at a distance of 2,200 miles - a fraction of the distance at which some satellites orbit the Earth.
A satellite image taken on August 1st appears to show something large sitting outside a remote hangar at the base.
Russia is reportedly working on a ground-based laser weapon capable of interfering with satellites in space.
The space agency is planning to launch a constellation of lunar navigation and telecommunication satellites.
For years, some have speculated that this unusual piece of space junk is actually an extraterrestrial device.
Both the US and UK have expressed concern about an apparent test launch of a Russian space-based weapon.
Sir Richard Branson's new satellite launching company didn't have much luck with its debut flight yesterday.
A 'jam-proof' communications satellite for the newest branch of the US military has successfully launched.
A tiny natural satellite that may have been in orbit for as long as three years has been spotted by scientists.
An ambitious effort to bring satellite Internet access to all could end up generating countless UFO reports.
Satellite images have revealed the existence of a lake of molten rock on the British island of Mount Michael.
A Dutch UFO website was inundated with reports on Saturday after a conga line of lights appeared in the sky.
India has blown up one of its own satellites, producing space debris that could end up colliding with the ISS.
A Russian satellite has picked up mysterious 'explosions of light' in our planet's upper atmosphere.
A firm in Russia is working to create the world's first space billboard using a constellation of small satellites.
A Japanese startup has launched a satellite in a bid to create the first ever artificial meteor shower.