Wake up call
BERLIN, GERMANY- The frist signal was sent back to earth from a comet-chasing spacecraft that's been in hibernation for almost three years.
The European Space Agency received the all-clear message "Hello World!" from its Rosetta spacecraft some 500-million miles away.
It was put into hibernation to conserve energy for its journey to meet comet 67P/Churyumov-Gerasiemenko.
The plan is to rendezvous with the comet and drop a lander onto its surface in November.