Planetary defence experts prefer nudging a threatening asteroid or comet out of the way, given enough lead time, rather than blowing it up and creating multiple pieces that could rain down on Earth
“This is spectacular that we’ve taken this first step … but we really need to also have that warning time for a technique like this to be effective,” said mission leader Nancy Chabot of Johns Hopkins University’s Applied Physics Laboratory, which built the spacecraft and managed the $325-million mission.Launched last year, the vending machine-size Dart – short for Double Asteroid Redirection Test – was destroyed when it slammed into the asteroid 11 million kilometres away at 22,500 kph.
“We’ve been imagining this for years and to have it finally be real is really quite a thrill,” said Statler.
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