The headlines looked like something the principal characters in an old science-fiction movie might be confronted with in an early scene:
"Astronomers discover mysterious 'dark matter,' " read The Inquirer's front page on Tuesday. "X-ray data suggest mass of the universe may halt expansion," the New York Times reported. The Washington Post said, ''Satellite finds dark matter that may bind the universe."
(To one friend, the Post headline seemed to go too far toward combining astrophysics and cooking advice. "It sounds like you wouldn't want to add too much of this stuff," she said, "or the universe might get too chewy.")