Solar eclipse and Earthshine

41:08glasses to watch the Sun set. >> Yeah. >> And then once they're in total solar eclipse territory, which we saw >> Yes. >> in Texas, now you can remove your glasses and you can see the actual solar um eclipse. So, before we get into that, I actually I want I want to show one more photo, which is the solar eclipse lasted about 54 minutes and that's what it looks like. The Sun is behind the Moon. The Earth is pointing up here and so you see that crescent on the Moon. >> Yeah, yeah. >> Where is that light coming from? >> I don't know. >> That's from the Earth. >> Earth. As it's pass as the light is passing from the

41:48Sun across the Earth and it >> It's bouncing off the Earth. The Earth is literally so bright >> That's so crazy. >> that it is creating a crescent on the Moon. It's acting like another sort of lighting light source, you know? >> Light light >> movies, right? There's like the primary light source, it's behind, but there's a secondary light source from the Earth that is bouncing >> Yeah. >> light >> Yeah. >> to the Moon. >> Yeah. We got a hair light. >> Yeah, it's called Earth shine. >> This is >> Earth set, Earth shine. Uh these are I didn't this >> Just incredible. Incredible photographs. And there are around the moon you see the corona, which is the sun's outer atmosphere >> Right.

42:28>> that is spewing out solar wind and all sorts of other stuff. There's a lot of really cool helio physics that goes on in the corona. One of the biggest unsolved mysteries about the sun is why is the corona so hot? >> Right. >> 2 million Kelvin, 2 million degrees Celsius. Really shouldn't be >> Right. >> given that the surface of the sun is only like 6,000 degrees Celsius. >> Mhm. >> So, why is the outer outer atmosphere the same temperature as the core when you've got the photosphere, the outer surface of the sun at like 6,000? >> Yep. >> You you go you go from millions to 6,000 back to millions. Doesn't make any sense. >> Doesn't make any sense. >> So, this is one of the things that astronomers are working on. We've got a pretty good handle on it. Has to do with

43:09magnetic fields and things like that. But, it's always nice to, you know, observe and get more data. >> Yes. >> Um one of the things that I wanted to