A NASA spacecraft rammed an asteroid at blistering speed Monday in an unprecedented dress rehearsal for the day a killer rock menaces Earth.

The $325 million mission was the first attempt to shift the position of an asteroid or any other natural object in space.

The galactic grand slam occurred at a harmless asteroid 7 million miles away

with the spacecraft named Dart plowing into the small space rock at 14,000 mph.

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.