The spacecraft that NASA deliberately crashed into an asteroid last month succeeded in nudging the rocky moonlet out of its natural orbit, the first time humanity has altered the motion of a celestial body, NASA's chief announced on Tuesday.
"This is a watershed moment for planetary defense and a watershed moment for humanity," NASA chief Bill Nelson told reporters in announcing the results.
The celestial target of the DART flight was an egg-shaped asteroid named Dimorphos, roughly the size of a football stadium, orbiting a parent asteroid about five times bigger called Didymos once every 11 hours, 55 minutes. Comparison of pre- and post-impact astronomical measurements of the Dimorphos orbit around Didymos showed a 32-minute shortening of its trajectory, proving the exercise as a viable technique to deflect an asteroid from a collision course with Earth, if such an asteroid were ever discovered.
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NASA seeks new rockets for hurricane satellite launches after Astra failuresElizabeth Howell, Ph.D., is a staff writer in the spaceflight channel since 2022. She was contributing writer for Space.com for 10 years before that, since 2012. As a proud Trekkie and Canadian, she also tackles topics like diversity, science fiction, astronomy and gaming to help others explore the universe. Elizabeth's on-site reporting includes two human spaceflight launches from Kazakhstan, three space shuttle missions in Florida, and embedded reporting from a simulated Mars mission in Utah. She holds a Ph.D. and M.Sc. in Space Studies from the University of North Dakota, and a Bachelor of Journalism from Canada's Carleton University. Elizabeth is also a post-secondary instructor in communications and science since 2015. Her latest book, Leadership Moments from NASA, is co-written with astronaut Dave Williams. Elizabeth first got interested in space after watching the movie Apollo 13 in 1996, and still wants to be an astronaut someday.
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