The planetarium is closed for repairs, so the Magic School Bus blasts off on a real tour of the solar system. After their previous field trips, the children in Ms. Frizzle's class are all blase about such things; as they land on the Moon, Venus, and Mars, and fly by the other planets and the Sun, they comment on what they see, generate a blizzard of one- or two-sentence reports on special topics and--even while Ms. Frizzle is temporarily left behind in the asteroid belt--crack terrible jokes ("Could Saturn take a bath? Yes, but it might leave a ring!"). Although some of the information is radically simplified--people are said to float in space because "without a large mass nearby . . . they do not have weight"--Cole keeps the narrative specific without burdening it with loads of facts. Degen's fresh, energetic illustrations complement the breathless pace perfectly. A first-class introduction to the planets, fine for pleasure or purpose reading. --John Peters, New York Public Library Copyright 1990 Reed Business Information, Inc.