A simple tweet coming from the European Space Agency (ESA) confirms the return of the Comet-chasing probe Rosetta after 31 months of hibernation. The Rosetta, which has been placed in hibernation back in 2011 to conserve energy, is now back and ready for its long space mission of meeting up with Comet 67P/Churyumov-Gerasimenko.

"Hello, world!" the space agency wrote on Twitter account @ESA_Rosetta. According to the Sky News report, the scientists had to wait for over 8 hours before receiving the signal that the billion-dollar probe sent from a distance of more than 800 million kilometers.

The space agency has described the probe Rosetta as the "Sleeping Beauty" that emerged from a really long slumber. "It was a fairy-tale ending to a tense chapter," ESA's press release statement read in the News.com.au report.

Scientists at the mission control in Darmstadt, Germany can be seen how thrilled they were after receiving the important signal via Web cast. "This was one alarm clock not to hit snooze on, and after a tense day we are absolutely delighted to have our spacecraft awake and back online," Fred Jansen, the ESA's Rosetta mission manager, stated.

The spacecraft is scheduled to be inserted into an orbit about 25 kilometres above the Comet 67P in August with the use of 11 cameras, radars, microwave, infrared and other sensors scanning the surface. The comet-chasing probe also carries the 100-kilo robot anchor Philae designed to carry out the experiments while on a piggyback ride as the Comet circle around the Sun.

If Rosetta succeeds on its space mission, the probe will beat the other spacecrafts sent whose comet missions ended up as flybys. "With Rosetta, we will track the evolution of a comet on a daily basis and for over a year, giving us a unique insight into a comet's behaviour and ultimately helping us to decipher their role in the formation of the Solar System," project scientist Matt Taylor declared.

Scientists are now hoping that the space mission will be able to offer more evidence on the existence of the Solar System. "Rosetta should become a key element for our understanding of the history of the solar system," Stephan Ulamec, the Rosetta project manager, stated in the Reuters interview last December 2013.

Comet 67P/Churyumov-Gerasimenko is reported to be at its closest distance to the Sun on August 13, 2015. The Sydney Morning Herald reports the European space mission will be running until the end of year 2015.

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