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Moment of Truth for X-ray Telescope

rors to a graphite base with epoxy: They found they could turn on the lights-eight flourescent bulbs 3 meters away-for only a few minutes at a time. Otherwise the lights heated the air, changing its index of refraction and causing lasers to misread the mirrors' positions. "Body heat's a relevant factor" too, as well as drafts from open doors, says Harvey Tananbaum of the Harvard-Smithsonian Center for Astrophysics, who watched the operation. This week AXAF is being flown to NASA's Marshall Space Flight Center in Alabama, where engineers will shine a beam of x-rays through the mirrors from 500 meters away. About 90% of the reflected rays should fall within a circle 50 micrometers across. "I don't expect any major surprises," says Martin Weisskopf, chief scientist for AXAF. Tananbaum doesn't either, but he adds: "If we were 100% sure, we wouldn't test it, would we?"