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NASA is videos of sex with momsabout to intentionally crash a spacecraft the size of a vending machine into a space rock the size of a great Egyptian pyramid. 

Incredibly, you can watch this unprecedented Sept. 26 event live.

The mission is called DART, or Double Asteroid Redirection Test, and it's humanity's first-ever attempt to purposefully move an asteroid. The rocky target, Dimorphos, is not a threatto Earth, but the mission is an experiment to see how civilization could alter the path of a menacing asteroid, should one be on a collision course with our planet. (Fortunately, no known asteroidover 460 feet across will threaten Earth in the next century or so.)

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It's a $330 million critical mission. And it may one day pay off, big time.

"We are right now defenseless against any asteroid aiming for Earth."

"We are right now defenseless against any asteroid aiming for Earth," Markus Wilde, an associate professor of aerospace, physics, and space sciences at the Florida Institute of Technology, told Mashable.

As of the afternoon of Sept. 26, the mission was on track for impact.

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SEE ALSO: If a scary asteroid will actually strike Earth, here's how you'll know

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How to watch the DART spacecraft impact

The impact between the 1,300-pound DART spacecraft and Dimorphos — a 525-foot-wide asteroidthat actually orbits a much larger sibling, the half-mile-wide Didymos — will occur some 6.8 million miles from Earth. But the spacecraft has a camera (dubbed "DRACO") that will stream one image per second back to Earth in real time. Until the impact, of course.

Where to watch:NASA will livestream the impact on NASA TV. You can watch on NASA's website. You can watch on NASA TV's YouTube channel. Or you can tune into the embedded NASA livestream just below.

When to watch: Live coverage begins Sept. 26, 2022, at 6 p.m. ET. The spacecraft will impact Dimorphos at 7:14 p.m. ET.

Alternatively: If you'd like to just watch the "quiet" real-time feed from the DART camera, without the NASA presentation or explanation, you can tune into the NASA Live YouTube channel beginning at 5:30 p.m. ET.

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What happens after the asteroid crash?

To the asteroid, the impact will be like a little nudge or a smack. The goal is to prove that such a collision can slightly move a space rock from its ultimate trajectory. If it works, this is likely how humanity — with enough notice — will nudge a menacing space rock off its course in the future. NASA hopes to show it can slow Dimorphos' orbit around its sibling asteroid by around 10 minutes (the orbit currently takes about 12 hours).

"That's enough time to make sure it misses Earth," Andrew Rivkin, a planetary astronomer at the Johns Hopkins University Applied Physics Laboratory and one of DART's lead scientists, told Mashable.

The 50,000-year-old Barringer Meteor Crater in Arizona. An asteroid 100 to 170 feet across left this 600-foot-deep crater, an impact large enough to destroy a city. Credit: USGS / NASA / Joshua Stevens

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The collision, though relatively small, will still blow some 220,000 pounds of rock into space. And we'll be able to see this too, yet not right away. DART recently released a toaster-sized spacecraft called LICIACube, fitted with two cameras, that will observe both the impact and the aftermath. That footage will arrive in the days and weeks after the impact.

Enjoy the show.

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