By Jonathan Amos
Science correspondent, BBC News
Contact has finally been made with Russia's troubled Mars mission, says the European Space Agency (Esa).
The agency reports that its tracking station in Perth, Australia, picked up a signal from the Phobos-Grunt probe.
Esa is now working with Russian engineers to see how best to maintain communications with the craft.
Phobos-Grunt has been stuck in Earth orbit since its launch on 9 November, unable to fire the engine that would take it on to Mars.
It raises the hope that Russian controllers can establish what is wrong with the spacecraft and fix it.
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