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Text on screen: What will we experience on August 21?

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We are so excited for August 21.

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What is going to happen is the moon is going to cross

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in between the sun and the Earth and we're going to be treated

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to a spectacular show as that shadow goes across the

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Earth. Everywhere in North America, Central America

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and even bits of South America will get to see some

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portion of the eclipse - either partial or total.

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If you're in the path of totality that's going to be

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especially amazing because what happens is the moon will totally

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block out the main body of the sun and you'll get to

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see the sun's atmosphere, the solar corona, around the moon.

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And it's just going to be amazing.

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Text on screen: We've been told never to look directly at the sun (even with sunglasses!).

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Text on screen cont.: How can we enjoy this eclipse safely?

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That's correct, never look directly at the

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sun even with sunglasses on. What you want are

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safety eclipse glasses like these. And you can check to

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make sure that your eclipse glasses really are safety

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eclipse glasses by going to our webpage

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eclipse2017.nasa.gov. And on that webpage

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we have information of how to check. So, for example you want

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to look for an ISO number, cross check that

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with what we have on our webpage, and a manufacturer - again, cross check

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that with our webpage. During totality,

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if you are in that path you can take off your glasses and look

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directly at the sun during those couple of minutes.

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The other thing you can do is indirectly view the eclipse.

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So you can do that by creating a pinhole projection.

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You can do that with your hands and create a little pinhole with your fingers there.

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You want to stand with the sun at your back. Let

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the sun shine through your pinhole and then

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the image of the sun and the moon taking a bite out of the sun

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will be projected down on the ground in front of

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you.

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Text on screen: For those in the path of totality - when is it safe to finally take off our solar glasses?

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You can take

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off your solar glasses when you don't see anything

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any longer. That means that the moon has

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blocked out the main body of the sun at the atmosphere around it

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is now visible. Then, as soon as you start to see

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the sun peeking around the moon again you need to put those

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glasses right back on.

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Text on screen: We're not in the path of totality - what interesting things should we lookout for?

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So if you're

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not in the path of totality and you're going to get a

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partial eclipse, that is still really amazing. What's going to happen is

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the moon is going to go across the sun and take a

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bite out of the sun, creating crescent shaped

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shadows and uh - you'll be able to see those with

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a pinhole projector. You can also see those

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even if you stand in front of a tree. The shadow as

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it goes through the tree - the tree acts like a pinhole projector -

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you'll get images of the

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moon going across the sun in the shadow

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of tree and you'll be able to see that.

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Text on screen: Why are you excited for this eclipse?

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I am so excited about this eclipse because I

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study the solar corona. The solar corona is the part

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of the sun that we get to see during a total solar

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eclipse. It is the atmosphere of the sun and it's

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much less bright than the photosphere - the main body of the sun.

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So we usually don't get to see it. I get to

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study it with a NASA spacecraft that watches the sun all the

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time. But this total solar eclipse, getting to see it in person

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and getting to see it in this particular way, is so

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exciting to me.

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Text on screen: How can we watch the eclipse if the weather isn't on our side on August 21?

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nasa.gov/eclipselive

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is doing live coverage of the

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eclipse - of the path of totality. We have stations

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all across the country watching the total solar

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eclipse, and we have airplane coverage of

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the total solar eclipse. So, whoever gets

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to see the eclipse, we will be covering and we'll have

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coverage of that. So if you're in the partial phases

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of the eclipse or if it was clouded out in your area, check us

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out and watch our live coverage of the eclipse.

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Text on screen: Why does an eclipse only last for a few minutes?

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An eclipse

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only lasts for a couple of minutes because of the precise geometry.

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We have to get this perfect geometry - this perfect lineup

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between the sun, the moon and the Earth. And to get that

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to line up just exactly perfect, the shadow

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at a given place on the Earth only lasts a

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couple of minutes.

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Text on screen: What happens to Earth during the eclipse?

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As the eclipse happens, it's effectively

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turning into night in just a small location

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on the Earth for just a brief period of time.

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And that's really strange. The atmosphere is

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going to respond and become cooler.

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The cloud coverage could change. The ionosphere

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could change. And we have um an App called Globe

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Observer App and we are encouraging citizen scientists to

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tell us what is going on - what they are observing

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as the eclipse is happening. So if you have a thermometer

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and get the Globe Observer App on your phone then

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you too can be a citizen scientist and help NASA

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collect data on how the Earth is responding

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to the eclipse.

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Text on screen: If you were looking back at Earth during the eclipse what would you see?

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In fact we do

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look back at the Earth during the eclipse.

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Uh - spacecraft, one of them is called DSCOVR,

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and it sits in-between the sun and the Earth, watching

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the Earth and it will watch the eclipse as it happens.

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It will watch the shadow of the moon cast

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across the Earth and go across the Earth.

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The Lunar Reconnaissance Orbiter is another mission that usually watches

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the moon, but for this eclipse it is going to point and look

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at the Earth and watch the shadow of the moon go across the Earth.

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And the International Space Station is also going to get to see

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the shadow of the moon across the Earth.

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Text on screen: How has our precise mapping of the moon helped us predict the path of eclipses?

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The Lunar Reconnaissance

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Orbiter has taken very precise measurements of the

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moon. It has precise measurements of the topography -

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the mountains, the valleys, the craters. Because the moon

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is not a perfect sphere, and so that shadow that it casts down

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onto the Earth is not a perfect circle. The details of

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the topography are what help us know exactly what that shadow is

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going to look like when it hits the Earth.

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Text on screen: Where can we learn more?

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You can learn more at

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eclipse2017.nasa.gov - that's where we have

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all sorts of information. Everything from safety,

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to detailed maps of what you're going to see in

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your area. We also have

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event information, uh, local

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libraries, zoos, museums, things like that, are hosting

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eclipse parties. And you can find out what events

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are going on in your area.

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