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An explosion. the heat would volatize, vaporize, oblate, burn off some of the asteroid, and that momentum of the pushed-off stuff would push the asteroid. that may work. but even simpler and more straightforward is just hitting the asteroid with something very small but going very, very fast. d.a.r.t., double asteroid redirection test, is going about four miles a second, four miles a second. >> wow. >> so it has a lot of momentum. so when we hit this smaller asteroid, we are very hopeful that it will give it a nudge. now, the composition of the asteroids is not exactly known. so they're so-cal...

Spacecraft on a collision course with an asteroid has a dress rehearsal for armageddon. phil keating explains from miami. >> and with this flawless launch from california's air force base, nasa's first of its kind asteroid smasher is on its way here it ultimately this mission to save our planet and all of humanity from annihilation. it is called the dork and stanford double asteroid and part of the planet tory defense testing one method of deflection technology. the first test of planetary defense, it is an intentional crash to erupt and of course, what we are trying to learn is how to deflect...

If you switch to cabenuva, attend all treatment appointments. with once-a-month cabenuva, i'm good to go. ask your doctor about once-monthly cabenuva. about once a year we get a visit from a car size asteroid. not impressive enough for a movie plot but it makes it cool fireball as it enters the earth's atmosphere, burdens up before it reaches the surface of the earth. about every few thousand years. we get hit by an asteroid the sides of a football field, and they can cause major damage. so a group of scientists at nasa's planetary defense coordination office keep track of as many those near e...

One. so this did the most binary asteroid, did almost in die morph us if you are in to have been aiming. isn't asteroid where you have a wide center, like this double strawberry. and then you have another asteroid going around it like the blueberry. so if you can hit the blueberry with a spacecraft, like the strawberry leaves, then you can slow the smaller asteroid down. ever so slightly. and then one an object is closer to the larger object it will go run faster. that is why, for example mercury goes around the sun much faster than earth us. and we will be able to detect this tiny change in t...

That momentum of the pushed off stuff. that me work. but even simpler, and more straightforward, is just hitting the asteroid with something very small but going very very fast. dart, double asteroid redirection test, is going about four miles a second. for miles a second. >> wow. >> so it has a lot of momentum. we hit this asteroid, we are very hopeful that it will get it a notch. the composition of the asteroid is not exactly known. so there are so called escape yes, we are confident that when we hit it with this dart spate crossfit will give it a push rather than go right through. -- so eve...