1 00:00:00,060 --> 00:00:11,100 Music 2 00:00:11,120 --> 00:00:15,240 Narrator: This is a kinesthetic model to help participants 3 00:00:15,260 --> 00:00:19,440 understand the effect that a black hole has on objects in its neighborhood of space. 4 00:00:19,460 --> 00:00:23,590 All participants should be assigned one of four roles: black 5 00:00:23,610 --> 00:00:27,710 hole, orbiting star, nearby star, or distant star. 6 00:00:27,730 --> 00:00:31,740 You should scale the number of people in each role appropriately to the size of your group. 7 00:00:31,760 --> 00:00:35,770 A four or five foot diameter circle should be marked-out 8 00:00:35,790 --> 00:00:39,810 on the floor. Using a rope or cord is an excellent temporary way to do this. 9 00:00:39,830 --> 00:00:43,870 Participants assigned to the role of black hole should stand in the 10 00:00:43,890 --> 00:00:48,010 center of the circle. The circle represents the black hole's event horizon, the 11 00:00:48,030 --> 00:00:52,090 point of no return. Anything that comes within the circle cannot escape the black 12 00:00:52,110 --> 00:00:56,110 hole. Participants assigned the role of orbiting star should start 13 00:00:56,130 --> 00:01:00,140 orbiting just outside of the roped circle. These objects are fully under the influence 14 00:01:00,160 --> 00:01:04,150 of the black hole's gravity but still remain separate objects. Those 15 00:01:04,170 --> 00:01:08,180 assigned the role of nearby star will be orbiting a bit farther away from the circle. 16 00:01:08,200 --> 00:01:12,200 They are still influenced by the gravity of the black hole, but may also have other influences 17 00:01:12,220 --> 00:01:16,240 on their motion. They may at times come closer to the black hole while at other 18 00:01:16,260 --> 00:01:20,280 times moving much farther away. The last of the participants 19 00:01:20,300 --> 00:01:24,380 are assigned the role of distant stars. They are even farther from the black hole and are 20 00:01:24,400 --> 00:01:28,410 too far away to be affected by its presence. For the most 21 00:01:28,430 --> 00:01:32,530 part, these objects continue in their roles with little deviation. A nearby 22 00:01:32,550 --> 00:01:36,580 star might very occasionally come close enough to bump an orbiting star into the black hole, 23 00:01:36,600 --> 00:01:40,710 but it's a rare occurence. Contrary to popular mythology, the black hole 24 00:01:40,730 --> 00:01:44,830 does not immediately suck up everything in its neighborhood, so in our activity 25 00:01:44,850 --> 00:01:48,910 want everyone to end up in the black hole. Just as it plays out in the universe, 26 00:01:48,930 --> 00:01:52,920 not much changes, even if you've got a black hole in your distant neighborhood. 27 00:01:52,940 --> 00:01:56,950 Music 28 00:01:56,970 --> 00:02:00,970 Music 29 00:02:00,990 --> 00:02:06,006 Music