1 00:00:00,050 --> 00:00:04,090 music 2 00:00:04,110 --> 00:00:08,180 On August 21, 2017, the Earth will cross 3 00:00:08,200 --> 00:00:12,230 the shadow of the Moon, creating a total solar eclipse. 4 00:00:12,250 --> 00:00:16,290 Eclipses happen about every 6 months, but this one is special. 5 00:00:16,310 --> 00:00:20,420 For the first time in almost 40 years, 6 00:00:20,440 --> 00:00:24,490 the path of the Moon's shadow passes through the continental United States. 7 00:00:24,510 --> 00:00:28,680 Everyone there will see the Moon at least partially block the sun. 8 00:00:28,700 --> 00:00:32,740 People within the path of totality, shown here 9 00:00:32,760 --> 00:00:36,800 in red, will witness a total solar eclipse. 10 00:00:36,820 --> 00:00:40,840 For them, the Moon will cover the sun entirely. 11 00:00:40,860 --> 00:00:44,960 The sky will become twilight, the air will cool, the stars will appear, 12 00:00:44,980 --> 00:00:49,270 and the black disk of the Moon will be surrounded 13 00:00:49,290 --> 00:00:53,390 by the pale, streaming halo of the sun's corona. 14 00:00:53,410 --> 00:00:57,590 Totality will last for 2 minutes or a little more, and it will be 15 00:00:57,610 --> 00:01:01,790 visible along a swath that crosses the continent from Oregon to South Carolina. 16 00:01:01,810 --> 00:01:05,920 For some, it will be the spectacle of a lifetime. 17 00:01:05,940 --> 00:01:10,140 music 18 00:01:10,160 --> 00:01:14,150 tone 19 00:01:14,170 --> 00:01:18,180 beeping 20 00:01:18,200 --> 00:01:19,793 beeping