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.