... These questions, among the most important and baffling to astronomers since the beginning of the modern astronomical era, might well be answered by a new space satellite mission. The Rotating Jets of Comet Hyakutake . ... The Compton Observatory Turns Five . ... Earlier this April, NASA's Compton Gamma Ray Observatory, completed its fifth successful year in orbit, exploring the gamma ray sky. ... Unexpected X-rays from Comet Hyakutake . ... Uranus's Moon Oberon: Impact World . ... April . ...