Space: Nuclear Fears About Galileo

If the shuttle Atlantis lifts off this week from its Cape Canaveral launch pad as planned, astronomers will let out a long-delayed cheer. At last the Galileo mission, which has languished for more than a decade because of technical debates and the Challenger explosion, will be getting under way. Astronauts on Atlantis will release the Galileo spacecraft, setting it on a six-year, 2.5 billion-mile journey to Jupiter. There the probe will take the first direct measurements of the planet's dense clouds and hurricane-like winds.

Few doubt the scientific value of the Galileo flight. Nonetheless, a sharp controversy has dogged the mission....