NASA spacecraft headed towards asteroid. Here's how to watch
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It sounds like a movie plot, but it’s actually an experiment that could have big implications for planetary defense.

Want to see a spacecraft smash into an asteroid… for science? 

It sounds a lot like a movie plot, but it’s actually a NASA experiment that could have big implications for planetary defense. If the spacecraft — named Dart — can knock a small, harmless asteroid into a changed orbit, we might have a fighting chance if a killer asteroid ever comes Earth’s way. 

NASA says it will stream a live feed from the spacecraft, which you can watch below and on the agency’s website.

According to the schedule on NASA’s Live webpage, live coverage starts at 6 p.m. Eastern. For the moment of the crash, NASA is aiming for 7:14 p.m. Eastern.

The $325 million planetary defense test aims to nudge the asteroid (named Dimorphos, if you’re wondering) into a tighter path around the larger space rock it orbits. We won’t know right away if the test works — it may take days or weeks to measure any changes.

Either way, NASA says there’s no chance Dimorphos or its larger friend will ever threaten Earth.

What to expect: 

Dart, short for Double Asteroid Redirection Test, has just one camera for navigating, targeting, and filming the test. 

Dimorphos will emerge as a point of light an hour before impact, looming larger and larger in the camera images beamed back to Earth. Managers are confident Dart won’t smash into the larger space rock by mistake. The spacecraft’s navigation is designed to distinguish between the two asteroids and target the smaller one.

You won’t see an action movie explosion when Dart, lighter than a compact car at 1,260 pounds, slams into 11 billion-pound Dimorphos.

“This really is about asteroid deflection, not disruption,” Nancy Chabot, a planetary scientist and mission team leader at the Johns Hopkins University lab managing the project, told the Associated Press. “This isn’t going to blow up the asteroid. It isn’t going to put it into lots of pieces.”

Instead, the crash will cause a substantial crater and hurl 2 million pounds of rocks and dirt into space. And of course, it will be the end of the road for Dart. 

What if it misses? 

NASA puts the odds of a miss at less than 10%. If Dart misses both asteroids, it will try again in a couple years for take 2. 

READ MORE: NASA spacecraft to crash into asteroid on Monday

Associated Press reporter Marcia Dunn contributed to this report.

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