NASA's Double Asteroid Redirection Test, also known as DART, slammed into an asteroid Monday night in its first planetary defense test that could protect Earth from future threats. "And we have impact! Fantastic! Oh! Fantastic," were the first words from inside Johns Hopkins University Applied Physics Laboratory right after the DART vehicle collided with its target, Dimorphos, at 7:15 p.m. EDT, generating cheers from NASA engineers who worked for years ...