1 00:00:00,000 --> 00:00:00,875 PROFESSOR: All right. 2 00:00:00,875 --> 00:00:03,870 So effectively we'll start off by talking 3 00:00:03,870 --> 00:00:07,920 about why people think that time travel is not possible, 4 00:00:07,920 --> 00:00:11,390 all the supposed "theoretical" experiments that 5 00:00:11,390 --> 00:00:12,790 proved that it's not possible. 6 00:00:12,790 --> 00:00:15,260 And then we'll explore a little bit more 7 00:00:15,260 --> 00:00:20,700 into, like, what's the definition of time travel, 8 00:00:20,700 --> 00:00:23,550 because we can talk about time traveling, like we're traveling 9 00:00:23,550 --> 00:00:25,590 through time right now, it's just 10 00:00:25,590 --> 00:00:28,340 at, like, a pace of one second per second. 11 00:00:28,340 --> 00:00:30,200 So we can talk about time dilation 12 00:00:30,200 --> 00:00:33,790 and explore how we can travel at periods of maybe seven 13 00:00:33,790 --> 00:00:35,430 seconds per second. 14 00:00:35,430 --> 00:00:39,520 And then after that, we go a little more in-depth 15 00:00:39,520 --> 00:00:43,530 in a bit more layman terms of how time dilation works. 16 00:00:43,530 --> 00:00:48,190 And then we ask, like, so if we can travel forward in time, 17 00:00:48,190 --> 00:00:50,550 can we travel backward in time? 18 00:00:50,550 --> 00:00:52,650 And that brings in the whole concept 19 00:00:52,650 --> 00:00:56,990 of, like, how you need more-- when you increase 20 00:00:56,990 --> 00:01:01,140 the speed of an object, the mass of the object increases, 21 00:01:01,140 --> 00:01:03,000 and then you also require more energy. 22 00:01:03,000 --> 00:01:05,430 And when you put in more energy, you may not necessarily 23 00:01:05,430 --> 00:01:08,870 increase the speed, and therefore it's 24 00:01:08,870 --> 00:01:11,110 still a big question whether time travel is actually 25 00:01:11,110 --> 00:01:12,950 really possible.