CAPE CANAVERAL, Fla. (AP) — A NASA spacecraft closed in on an asteroid at blistering speed Monday in an unprecedented dress rehearsal for the day a killer rock menaces Earth. The galactic grand slam was set to occur at a harmless asteroid 7 million miles (9.6 million kilometers) away, with the spacecraft named Dart plowing into the rock at 14,000 mph (22,500 kph). Scientists expected the impact to carve out a crater, hurl streams of rocks and dirt into space and, most importantly, alter the asteroid’s orbit. Telescopes around the world and in space were poised to capture the spectacle. Though the impact should be immediately obvious — with Dart’s radio signal abruptly ceasing — it will be d
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