The Russian spacecraft that became a ghost in Earth's orbit

Space · Published 17 October 2026 Swipe more like this →

In short: Fobos-Grunt was intended to be a historic first: returning macroscopic soil samples from Mars' moon, Phobos. Instead, it became a high-tech wanderer. After a failed engine burn, the craft spent weeks drifting in low Earth orbit, communicating in fragments before its final, uncontrolled descent.

Launched on November 8, 2011, from the Baikonur Cosmodrome, Fobos-Grunt was a flagship project for the Russian Federal Space Agency. It was designed to return up to 200 g of soil from Phobos, making it the first mission to retrieve such a sample from an extraterrestrial body since 1976. The mission was a complex international effort, carrying China's Yinghuo-1 orbiter and a Planetary Society experiment designed to test if organisms could survive deep space travel—a concept known as transpermia.

The mission faced significant hurdles before launch, including a year-long delay due to software integration issues and a change in leadership at NPO Lavochkin. While the Zenit-2SB41 rocket successfully placed the craft into a 207 km × 347 km low Earth orbit, the critical next step failed. The autonomous propulsion unit, derived from the Fregat upper stage, failed to ignite for its first burn. This left the spacecraft stranded in a parking orbit rather than on its path to Mars.

A mysterious period of 'ghost' activity followed. While engineers feared the batteries were dead, the craft's solar panels deployed, allowing it to remain functional. It even appeared to autonomously adjust its perigee. The European Space Agency (ESA) managed to pick up brief telemetry from a station in Perth, Australia, but the signals were too weak to diagnose the specific power or mechanical failure. By early December 2011, the craft was identified as falling a few kilometers each day, eventually leading to its uncontrolled re-entry over the Pacific Ocean on January 15, 2012.

The project's failure highlights the immense difficulty of interplanetary sample returns. Lead scientist Alexander Zakharov had previously described the mission as 'possibly the most difficult interplanetary one to date.' Despite the loss, the mission's development involved significant international cooperation, including a 2007 agreement with China and contributions from Bulgarian, Finnish, and Polish scientists.

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