Dr. Neil deGrasse Tyson host of the NOVA scienceNOW PBS program
From a half billion kilometers away, the message was powerful. In 1994, fragments of the Shoemaker-Levy 9 comet slammed into Jupiter. The earth-size fireballs ejected into space were captured and relayed back to be seen again and again in Internet replay. The message: we need a foothold in space if our species is to survive.