00:00DART is the double asteroid redirection test.
00:05The Earth is hit by asteroids and pieces of asteroids all the time.
00:10Every year or so we get hit by things maybe the size of a table.
00:14The kind of object that DART is going to visit is an object that's about the size of the Washington Monument.
00:20Those kinds of objects hit us every few thousand years and they would cause severe damage to a regional scale.
00:27We chose to do this demonstration at a binary asteroid.
00:31It's called Didymos. This is actually approximately the shape of the main asteroid.
00:37It's called Didymos A and it's moon, Didymos B.
00:41What DART will do is DART will hit the secondary.
00:46When it hits the moon it will change the orbit period.
00:49And when it changes the orbit period it affects the timing of when the moon moves in front of or behind the primary.
00:59Mostly what we're looking to do is change the speed of the incoming object by maybe a centimeter per second or so.
01:06That's not very fast but if you do it enough seconds in advance you can cause it to miss the Earth entirely.
01:12DART is a part of a larger collaboration called AIDA which pulls in all the experts of the world who can help their governments predict and understand what it is that they can do and should do in the event that there was an incoming threat.
01:30The DART mission that APL is pulling together will be the first mission in that flight line.
01:36The DART mission that APL is being the first mission in the event of the entire world and the לא�P and the APL after the first mission in the event that is a very good one to get out of sight.
01:38The DART of the order of the AIDA.
01:40In fact the most Virus and the European стол INVITS is a great point.
01:42The DART, if they don't consider how to get out of sight, they can stop the moment or the end.
01:44The DART, if they want to get out of sight but do they can see it.
01:46Those who want to get out of sight.
01:48The DART means the way to get out of sight.
01:50The DART has got of sight of sight.
01:52The DART has got of sight.
01:54The DART has got of sight of sight.
01:56The DART it's a great point which is a great view on the ground floor.
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