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Finally tonight, the new frontier in space. nasa's deliberate collision with an asteroid. here's abc's gio benitez. >> reporter: tonight, nasa on the eve of a potential breakthrough in space exploration. scientists hoping to witness its spacecraft crashing into an asteroid 7 million miles from earth, calling it an important step in planetary defense. >> so far, nothing recent enough that it has a large impact on our civilization, but it could happen. >> the mission is designed to show how nasa may be able to redirect a dangerous asteroid that may some day threaten earth. >> liftoff of the falc...

Spaceis because the physics of objects in space is a lot more straightforward in many respects in the weather. there is no risk to us from this object the nasa dart mission is hurtling towards and in fact the biggest risk from any object we know of currently at about one in 2000 chance of a collision with an object sometime between 2170—2290, a long way off, a tiny risk, and that's the biggest threat we know of. it shouldn't give us any... is that why they are doing this? irate shouldn't give us any... is that why they are doing this?— shouldn't give us any... is that why they are doing th...

Sounds like something from a science fiction movie. tomorrow a nasa spacecraft will slam into an asteroid to see if this impact can deflect an asteroid that might be hurtling toward earth one day. >> this comet is what we call a planet killer. >> a global killer. >> reporter: hollywood's been scheming up ways to save the world from killer asteroids for decades. >> anybody want to say no? >> reporter: instead of bringing in bruce willis nasa is about to test a new idea for the fist time. >> it is what we fear. what if there's an asteroid coming to earth? can you stop it? for the first time the

This time it's going to be about 37 days. see my little orion capsule module here, one of the biggest things that's going to be tested is upon re-entry, it's going to be hurtling along, heat shield first, 25,000 miles per hour. our atmosphere is going to give it the brakes to create friction and all of a sudden it's going to be experiencing heat of almost 5,000 dregrees. so that will be another real test. it's something you cannot test here on earth. you have to test for that in a test flight such as this. so the heat shield will be tested. by the time it slows down and the parachutes deploy a...

Have gone. nasa is going to lose contact with orion when it is on the far side of the moon. it will be circling the moon for about a week. to get back to earth, they are going to use a lunar gravity assist slingshot. they're gonna fire their own engines. they will come hurtling back to years. again, faster and harder than ever before. big test for those heat shields. tiffany, i want to show you a little bit of all the components of the rocket. i will show you how we'll get around in there. these are the most efficient engines ever built. these boosters, each one of them is 17 stories tall. eac...