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How Russia's Martian moon probe got stuck orbiting Earth

Launched Tuesday, Russia's Phobos-Grunt spacecraft was meant to explore the Martian moon Phobos. But, in what could mark the fourth Mars probe failure in a row, Phobos-Grunt now threatens to become another piece of space junk uselessly orbiting Earth. 

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An equipment failure Tuesday derailed Russia's unmanned Phobos-Grunt probe, shown here in Kazakhstan's Baikonur Cosmodrome, which was intended to visit the Martian moon of Phobos and return with soil samples. Instead, the probe is now orbiting Earth.

Russian Roscosmoc space agency/AP

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A robotic Russian spacecraft that launched on a mission to the Mars moon Phobos Tuesday (Nov. 8) is apparently stuck in Earth orbit, but hope for the probe is not lost yet, according to news reports.

The Phobos-Grunt spacecraft launched at 3:16 p.m. EST (2016 GMT) Tuesday and was supposed to be on its way to Phobos by now. The probe separated from its Zenit rocket properly, but its own thrusters then failed to fire in order to send the spacecraft streaking toward Mars, Russian officials said.

"It has been a tough night for us because we could not detect the spacecraft [after the separation]," Russian space agency chief Vladimir Popovkin said, Russian news agency RIA Novosti reported. "Now we know its coordinates and we found out that the [probe's] engine failed to start."

Popovkin added that engineers aren't yet sure why Phobos-Grunt's engine didn't ignite, according to RIA Novosti. It's possible the onboard computers didn't send the proper command, he said.

Whatever the cause, the malfunction dealt a serious blow to the $163 million Phobos-Grunt mission, which aims to grab bits of Phobos' surface and send them back to Earth by 2014. But there may still be hope for the spacecraft, Russia's first attempt at an interplanetary mission since 1996.

"We will attempt to reboot the program," RIA Novosti reported Popovkin as saying. "The spacecraft is currently on a support orbit, the fuel tanks have not been jettisoned, and the fuel has not been spent."

Engineers have about three days to figure out and fix the problem, Popovkin added. After that time, Phobos-Grunt's batteries will run out, and the spacecraft will likely turn into just another piece of space debris. [Photos: Russia's Phobos-Grunt Mission to Mars Moon]

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