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Transcripts for CNN New Day With John Berman and Brianna Keilar 20240604 12:53:00

Oh my gosh! whoo! oh, wow! reporter: the nasa crew and scientists around the world celebrated the culmination of a grueling journey live. fantastic! oh, fantastic. d.a.r.t. s mission, the first of its kind, was to test technological capabilities to protect humanity from hazardous asteroids or other deadly objects in space. to see it so beautifully concluded today was just an incredible feeling. and also, very tiring. reporter: the d.a.r.t. spacecraft was about the size of a refrigerator. its target asteroid, demorphous is about the height of the washington monument. over the last seven years, thousands of people have been working on this planetary defense mission. this is an important test for planetary defense mitigation strategies, in case we ever have to do this for year. ....

Hazardous Asteroids , Target Asteroid , Dart Spacecraft , Planetary Defense Mission , Planetary Defense Mitigation Strategies , Washington Monument ,