AUSTRIA-SCIENCE-ASTRONOMY-SPACE-COMET-ROSETTA-LANDER-PHILAE

Matthew Taylor, scientist of the Rosetta program of the European Space Agency (ESA), speaks during the press conference of the European Geosciences Union-General Assembly 2015 in Vienna, Austria on April 14, 2015. There has been no word from Europe's comet lander Philae in the two days since communications channels were reopened, mission scientists said, but chances were improving by the day. The spacecraft arrived at Comet 67P/Churyumov-Gerasimenko in August 2014 and the lander, Philae, has been on the comet's surface since November. AFP PHOTO / JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP via Getty Images)