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SpaceX is launching a NASA spacecraft that will crash into an asteroid

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November 23, 2021
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NASA’s Double Asteroid Redirection Test (DART) spacecraft is put in the nosecone of SpaceX’s Falcon 9 rocket in preparation for launch.

Ed Whitma / Johns Hopkins APL / NASA

Elon Musk’s SpaceX is set to launch a first-of-its-kind planetary defense mission for NASA in the early hours of Wednesday morning, sending the spacecraft on its way to intentionally crash into an asteroid.

“We’re smashing into an asteroid,” NASA’s Launch Services Program senior launch director Omar Baez said during a press conference. “I can’t believe we’re doing that”

Known as the Double Asteroid Redirection Test (or DART) mission, the space agency is trying to learn “how to deflect a threat that would come” toward Earth, NASA associate administrator of the science mission directorate Thomas Zurbuchen said.

“Rest assured, that rock right now is not a threat,” he said.

SpaceX is launching DART on a Falcon 9 rocket from Vandenberg Space Force Base in California, with a liftoff window that begins at 1:20 a.m. ET on Wednesday.

DART is a 610-kilogram spacecraft that will spend 10 months traveling to a pair of asteroids, which are named Didymos and Dimorphos. Johns Hopkins Applied Physics Laboratory in Maryland built DART, while space company Redwire contributed the spacecraft’s navigation and solar arrays that will power it.

The goal of the mission is to hit the smaller of the two asteroids, Dimorphos, with the spacecraft at about 15,000 miles per hour and see how the impact changes the asteroid’s trajectory.

An overview of the DART mission plan.

NASA/Johns Hopkins APL

The DART mission is costing NASA about $330 million in total, with SpaceX having won a $69 million contract in 2019 for the launch. Not only is it NASA’s first planetary defense mission, but DART also represents SpaceX’s first mission launching a spacecraft to another planetary body.

“This is just the coolest mission. Thank you all for enabling SpaceX to be a part of a really important planetary defense mission,” SpaceX director of civil satellite missions Julianna Scheiman said during a press conference.

SpaceX test fired its Falcon 9 rocket last Friday in preparation for the launch.

SpaceX’s Falcon 9 rocket with the Double Asteroid Redirection Test, or DART, spacecraft onboard is seen during sunrise on Nov. 23, 2021 at Vandenberg Space Force Base in California.

Bill Ingalls / NASA

To give a sense of scale, the Dimorphos asteroid is about the size of the Great Pyramid of Giza, while the Didymos asteroid is wider in diameter than the One World Trade Center tower in New York City is tall. After arriving at the asteroids, and before it smashes into Dimorphos, the DART spacecraft will deploy a small cube satellite to take photos of the impact event.

While the mission is testing a method of planetary defense, Zurbuchen emphasized that NASA is not aware of any near-term risks to Earth. There are billions of asteroids and comets orbiting the sun, but only a few have a chance of hitting the Earth for a very long time.

“Of all the near Earth objects that we know today, none of them are a threat within 100 years or so,” Zurbuchen said.

Infographic showing the sizes of the two asteroids in the Didymos system relative to some objects on Earth.

NASA/Johns Hopkins APL

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