Astronomers say a large asteroid will soon harmlessly zip past Earth. The space rock is called 1997 NC1 and was discovered almost three decades ago by an asteroid-tracking system in Hawaii. It'll make... NEW YORK (AP) — A large asteroid will zip past Earth this weekend, but don't worry: It poses no danger. The space rock — 1997 NC1 — makes its closest approach Saturday morning, coming within 1.6 million miles (2.6 million kilometers), according to th... [1233 chars]