41.   Black holes are massive celestial objects whose gravity is so powerful that nothing -- not even light -- can escape from one.

42.   Infrared astronomy allows scientists to peer through dust clouds in space and to break infrared light into constituent colors, revealing various properties of celestial objects.

43.   It surpassed the previous record-holder for the most distant known celestial object, a galaxy discovered last year by researchers in Hawaii and Cambridge, England.

44.   It collects and focuses both visible light from celestial objects as well as the faint heat they emit.

45.   Lithium is a primordial element present in the formation of celestial objects.

46.   The previous record for most distant known celestial object was held by a quasar just a hair closer to Earth than the newly discovered galaxy, Illingworth said.

47.   The system combines the light gathered from multiple telescopes to simulate a single, larger telescope that gives astronomers a sharper view of celestial objects.

48.   They also hope to better calculate the distance to celestial objects, useful in estimating the size and age of the universe.

49.   A team of US scientists has discovered evidence of galaxies more distant from Earth than any other known celestial object, NASA said Wednesday.

50.   Late Tuesday NASA had considered holding a sixth spacewalk to check a tracking device allowing the telescope to orient itself toward a particular celestial object.