... system, but they have done so indirectly, by measuring changes in gravity, speed or light around stars. NASA's space sciences chief Ed Weiler said the actual photos are important. He compared it to a hunt for elusive elephants: "For years we ...

... something's working well, you don't turn it off and just hope it comes back on," said Ed Weiler, NASA's space science chief. "We're not doing that cavalierly. We fully anticipate that everything will work fine. But it is a risk that ...

... here on early Earth, and just a host of questions about Saturn itself,'' said Wesley Huntress Jr., NASA's space science chief. Pioneer 11 and Voyagers 1 and 2 -- the only spacecraft to fly by Saturn -- provided tantalizing glimpses of ...

... this project kind of matches the majesty of the place where it's going,'' said Wesley Huntress Jr., NASA's space science chief. ''This is the second-largest planet in the solar system and you put the rings around it and it's the biggest ...