1 00:00:12,770 --> 00:00:09,549 [Music] 2 00:00:16,790 --> 00:00:12,780 a black hole is a single point in space 3 00:00:19,970 --> 00:00:16,800 that has a lot of mass one of the ways 4 00:00:22,490 --> 00:00:19,980 that we look for black holes is to 5 00:00:25,550 --> 00:00:22,500 develop new instruments and new 6 00:00:28,250 --> 00:00:25,560 technologies that can try to search for 7 00:00:33,410 --> 00:00:30,230 thank you 8 00:00:36,590 --> 00:00:33,420 as we've observed black holes including 9 00:00:38,770 --> 00:00:36,600 the the supermassive black hole in the 10 00:00:41,330 --> 00:00:38,780 center of our galaxy 11 00:00:44,690 --> 00:00:41,340 because it has such a strong gravity 12 00:00:49,130 --> 00:00:44,700 because it has lots of mass stars will 13 00:00:51,650 --> 00:00:49,140 orbit black holes and as stars get 14 00:00:55,310 --> 00:00:51,660 closer and closer to the center of the 15 00:00:58,610 --> 00:00:55,320 black hole as it crosses over the Event 16 00:01:01,010 --> 00:00:58,620 Horizon what will happen is that the 17 00:01:03,470 --> 00:01:01,020 material of these Stars will get 18 00:01:06,950 --> 00:01:03,480 shredded apart because the gravitational 19 00:01:09,649 --> 00:01:06,960 pull of a black hole is so strong that 20 00:01:11,630 --> 00:01:09,659 the material of the Stars gets pulled 21 00:01:14,510 --> 00:01:11,640 apart 22 00:01:16,429 --> 00:01:14,520 but there is an event horizon which is 23 00:01:19,310 --> 00:01:16,439 the point at which the black hole's 24 00:01:21,890 --> 00:01:19,320 gravity starts to to pull you so much 25 00:01:24,410 --> 00:01:21,900 that you can't escape so as you approach 26 00:01:26,030 --> 00:01:24,420 the black hole you'll feel its pull but 27 00:01:28,490 --> 00:01:26,040 then as you get closer and closer and 28 00:01:29,870 --> 00:01:28,500 closer towards the Event Horizon that's 29 00:01:32,210 --> 00:01:29,880 the point of no return so you couldn't 30 00:01:34,789 --> 00:01:32,220 escape past that 31 00:01:37,609 --> 00:01:34,799 the easiest way to think of a black hole 32 00:01:41,030 --> 00:01:37,619 is just like anything that has mass so 33 00:01:43,249 --> 00:01:41,040 the Earth has mass and one of the 34 00:01:45,170 --> 00:01:43,259 reasons that the moon orbits around the 35 00:01:48,770 --> 00:01:45,180 earth is because the gravitational 36 00:01:51,789 --> 00:01:48,780 attraction of these two massive bodies 37 00:01:54,830 --> 00:01:51,799 um and so Earth is distorting the space 38 00:01:57,830 --> 00:01:54,840 around the moon and so that's what keeps 39 00:02:00,410 --> 00:01:57,840 the moon in orbit and so now take that 40 00:02:03,950 --> 00:02:00,420 to an extreme so take something that's 41 00:02:06,590 --> 00:02:03,960 as massive as the sun or as massive as a 42 00:02:09,770 --> 00:02:06,600 Million Suns and put it at a single 43 00:02:13,729 --> 00:02:09,780 point and that Distortion that you get 44 00:02:17,110 --> 00:02:13,739 is coming from that amount of mass in a 45 00:02:22,670 --> 00:02:18,949 foreign 46 00:02:25,190 --> 00:02:22,680 black holes vary in size a lot we know 47 00:02:27,890 --> 00:02:25,200 that black holes can be formed by 48 00:02:30,770 --> 00:02:27,900 massive stars exploding and then 49 00:02:33,350 --> 00:02:30,780 collapsing into the singular point and 50 00:02:35,330 --> 00:02:33,360 those give us black holes that are about 51 00:02:38,630 --> 00:02:35,340 the mass of the Sun so those are solar 52 00:02:41,030 --> 00:02:38,640 mass black holes however we also know at 53 00:02:43,850 --> 00:02:41,040 the center of galaxies like the Milky 54 00:02:46,190 --> 00:02:43,860 Way There are super massive black holes 55 00:02:49,369 --> 00:02:46,200 and these are millions or even billions 56 00:02:53,030 --> 00:02:49,379 of times the mass of the Sun and how 57 00:02:57,050 --> 00:02:53,040 these form is actually a mystery 58 00:02:59,630 --> 00:02:57,060 studying black holes really gives us a 59 00:03:03,410 --> 00:02:59,640 fundamental insight into how gravity 60 00:03:06,770 --> 00:03:03,420 works because it's such a small physical 61 00:03:10,550 --> 00:03:06,780 scale but it's a super massive object 62 00:03:13,610 --> 00:03:10,560 and so understanding how black holes 63 00:03:15,890 --> 00:03:13,620 work and the interactions of black holes 64 00:03:18,110 --> 00:03:15,900 in in other parts of the universe really 65 00:03:20,030 --> 00:03:18,120 give us a fundamental Insight that we 66 00:03:22,850 --> 00:03:20,040 could then use to think about how our 67 00:03:25,670 --> 00:03:22,860 own solar system works 68 00:03:28,190 --> 00:03:25,680 and so if we can understand how black 69 00:03:31,800 --> 00:03:28,200 holes work it'll give us a key to really