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And so we'll be able to detect this tiny change in the period of the smaller asteroid. and this will prove or disprove the hypothesis that this so-called kinetic impact, energy impact, could deflect an asteroid in the future and, dare i say it, save the world. >> well, you and i are of an era where we had some great science fiction shows and books. and in those they would have just blasted any asteroid that threatened earth to smithereens. we apparently don't have that technology? >> no. plus there's a few problems with that. you'd have to get a large, let's say, nuclear weapon on top of a roc...

NASA’s first planetary defense mission is in space.

Up because we have no end of weaponry to do this. but that's not the wisest path. all engineering calculations tell us. because if you blow something up, while we're good at blowing it up, we're not as good as knowing where the pieces will end up. so it's safer and it's more controlled to deflect an asteroid from harm's way. and what we found is a double asteroid, so the d.a. in the d.a.r.t. stands for double asteroid redirect test. and we know the orbit of the moon. that's about the size of a football stadium. and it's in orbit around its host asteroid. and we know that orbit with good enough...

Again. >> reporter: so president biden is throwing major roadblocks in the former president's way in terms of sealing the documents from the committee, but obviously it's not the last step and trump will fight this in courts. >> thank you. it's always a lot. we appreciate it. coming up, steve bannon may think he has a way out of his deposition, but could he comply? we'll break down the consequences for trump allies who don't cooperate. we'll also ask if the abortion rights could make its way to the supreme court and what we can expect from the conservative majority. the year is 1998. bru...

Asteroid redirection test or dart for short is the first of its kind test a planetary defense, the mission is scheduled to launch in november, putting the spacecraft on a collision course with an asteroid in september or october of next year. >> it will come speeding in 15,000 miles per hour to hit this smaller asteroid. >> this is just a test. the asteroid in question is not on a collision course with earth. just close enough that when the spacecraft actually hits it a small change in its orbit could actually be observed from earth. >> it's just a small nudge, the key behind this is deflectio...