Abstract :
Powered flight tests are slated later this year for SpaceShipTwo, a craft built to carry humans on brief excursions more than 100 kilometers into space. And although publicity indicates that these travelers will be rich thrill-seeking "space tourists," some of them are, in fact, going to be scientists, engineers, and probably even graduate students on funded research programs, according to S. Alan Stern, a scientist now spearheading the development of this new concept.
