WEBVTT FILE 1 00:00:00.030 --> 00:00:04.020 [slate] 2 00:00:04.040 --> 00:00:08.040 [slate] 3 00:00:08.060 --> 00:00:12.110 Well on August 4 00:00:12.130 --> 00:00:16.180 21st the moon is going to move between the sun and 5 00:00:16.200 --> 00:00:20.310 the Earth and a shadow is going to cast down on the Earth 6 00:00:20.330 --> 00:00:24.480 The shadow will start in Oregon and travel 7 00:00:24.500 --> 00:00:28.560 about 1,400 miles an hour across 14 states 8 00:00:28.580 --> 00:00:32.660 ending in Charleston, South Carolina. Now everyone in 9 00:00:32.680 --> 00:00:36.830 North America, Central and part of South America will experience 10 00:00:36.850 --> 00:00:41.030 at least a partial eclipse. But folks in that 70 11 00:00:41.050 --> 00:00:45.120 mile wide path we call the path of totality will get an extra 12 00:00:45.140 --> 00:00:49.230 special treat. They will see the daylight turn to 13 00:00:49.250 --> 00:00:53.370 a moonlit night in a matter of a few minutes and for two 14 00:00:53.390 --> 00:00:57.560 to two and a half minutes they will get to see a total solar eclipse 15 00:00:57.580 --> 00:01:01.630 and view the sun's outer atmosphere, the corona, with their 16 00:01:01.650 --> 00:01:05.660 very own eyes. 17 00:01:05.680 --> 00:01:09.720 [slate] 18 00:01:09.740 --> 00:01:13.790 NASA is always studying the interaction between the 19 00:01:13.810 --> 00:01:17.900 sun and the Earth and the sun's impact on our atmosphere 20 00:01:17.920 --> 00:01:22.100 and this eclipse gives us a unique opportunity. So 21 00:01:22.120 --> 00:01:26.140 when the moon moves between the sun and the Earth it casts a shadow down 22 00:01:26.160 --> 00:01:30.220 on the Earth and we know when that shadow is there how big it is 23 00:01:30.240 --> 00:01:34.340 and we can even see in this image the amount of light 24 00:01:34.360 --> 00:01:38.400 that is not reaching the ground as that shadow 25 00:01:38.420 --> 00:01:42.590 is traveling across the Earth. And so by looking at that shadow 26 00:01:42.610 --> 00:01:46.660 we can look at clouds, changes in temperature, changes in humidity. 27 00:01:46.680 --> 00:01:50.770 And it gives us an opportunity to do our own experiment 28 00:01:50.790 --> 00:01:54.920 to study the impact of the sun on our environment 29 00:01:54.940 --> 00:01:58.940 and the weather. 30 00:01:58.960 --> 00:02:03.110 [slate] 31 00:02:03.130 --> 00:02:07.180 This is a great eclipse because it's covering the entire United States 32 00:02:07.200 --> 00:02:11.260 from coast to coast. But that means we can't have scientists at 33 00:02:11.280 --> 00:02:15.360 everywhere. So this is an opportunity for everyone in the United 34 00:02:15.380 --> 00:02:19.510 States to join us and be part of this grand experiment 35 00:02:19.530 --> 00:02:23.570 and be able to actually make your own measurement 36 00:02:23.590 --> 00:02:27.620 with an app through the GLOBE Observer program 37 00:02:27.640 --> 00:02:31.730 and a thermometer, you can help us 38 00:02:31.750 --> 00:02:35.780 measure changes in clouds, changes in temperature 39 00:02:35.800 --> 00:02:39.820 and gather huge amounts of data 40 00:02:39.840 --> 00:02:43.900 that we can then use to produce better climate and 41 00:02:43.920 --> 00:02:47.950 weather models to better understand our atmosphere. So we're looking forward 42 00:02:47.970 --> 00:02:52.030 everyone helping us make this the largest citizen 43 00:02:52.050 --> 00:02:56.070 science experiment ever. 44 00:02:56.090 --> 00:03:00.190 [slate] 45 00:03:00.210 --> 00:03:04.320 Well we've been studying 46 00:03:04.340 --> 00:03:08.490 this interaction between the sun and the Earth for over 40 years. 47 00:03:08.510 --> 00:03:12.560 Trying to figure out how much energy the sun is putting in 48 00:03:12.580 --> 00:03:16.670 to our atmosphere, how much makes its way down to the ground 49 00:03:16.690 --> 00:03:20.800 and how much escapes back out into space. So this eclipse 50 00:03:20.820 --> 00:03:25.000 is an opportunity to in a somewhat controlled 51 00:03:25.020 --> 00:03:29.050 environment to study this interaction, this 52 00:03:29.070 --> 00:03:33.140 input and output between energy in and energy out and we're hoping 53 00:03:33.160 --> 00:03:37.270 that everyone who observes this eclipse can join us 54 00:03:37.290 --> 00:03:41.450 and be part of this great experiment given to us by nature. 55 00:03:41.470 --> 00:03:45.490 [slate] 56 00:03:45.510 --> 00:03:49.570 Well there are two ways 57 00:03:49.590 --> 00:03:53.670 to really safely view the eclipse. To view it directly 58 00:03:53.690 --> 00:03:57.830 there you want to use safe solar viewing glasses or 59 00:03:57.850 --> 00:04:01.890 professionally made and certified filters. 60 00:04:01.910 --> 00:04:05.990 But you can also use indirect methods like pinhole projection 61 00:04:06.010 --> 00:04:10.090 You can even use your hands to make a, project 62 00:04:10.110 --> 00:04:14.220 the sunlight down onto the ground to see the 63 00:04:14.240 --> 00:04:18.430 moon in front of the sun and create this really cool crescent 64 00:04:18.450 --> 00:04:22.510 shadow. So it's very important that you get safe solar viewing glasses 65 00:04:22.530 --> 00:04:26.620 that are certified and are only no more than about three years 66 00:04:26.640 --> 00:04:30.640 old. 67 00:04:30.660 --> 00:04:34.840 [slate] 68 00:04:34.860 --> 00:04:38.900 Go to eclipse2017.nasa.gov. You can 69 00:04:38.920 --> 00:04:42.950 find out all about how to safety view the eclipse; where activities 70 00:04:42.970 --> 00:04:47.120 are happening all over the country. Even what libraries and museums 71 00:04:47.140 --> 00:04:51.190 are doing. There's lots of activities, as well as 72 00:04:51.210 --> 00:04:55.250 information about the science and the citizen science that NASA 73 00:04:55.270 --> 00:05:00.480 and all of our partners are doing from coast to coast.