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United states in 99 years. >> exactly. >> since 1918. the last time. the last total eclipse, not completely across the united states. >> exactly right. >> this is a moment we're watching this total eclipse. this is in casper, wyoming. shortly -- we'll keep this picture up for viewers. tell viewers what to anticipate. >> at this point with the sun just now -- there it goes. that's the bead. there's the diamond ring effect. and now, of course, that's overexposing. put the filter back on. right. doing it right. >> doing the filter. >> yep. whoops. got to get that filter on. yeah. i hope they didn...

What triggers the flares and explosions. if we can get an idea of what triggers them, we can get more of a predictive mechanism for determining the existence of what chris was calling coronal mass ejections. >> so, david, for all we know about the sun, there's still a lot we don't know about what causes they flares? >> absolutely. we can now predict some types of flare events, oh, 14 hours in advance, which isn't bad. >> look at that. >> here it comes. i love that. >> we call it bailey's beads, because there was a guy named bailey who first described them, but i element it as the diamond ring ...

Bottom, and then it will start back up. so we really feel a cooling effect. >> it is strakiiking, grag, bute combination of the heat, humidity, the lightning and thunder. the diamond ring effect. we get one bright point of light with that halo around the moon. >> for those just tuning in, why are we seeing that? >>. >> the first burst ray of son creates that bright point of light. >> craig, i'm sure you would love to be back in your home state, but it was nice to talk

And important processes are taking place. >> this total eclipse will last minutes, about, and slowly all of a sudden the sun re-appears? >> exactly right. >> it will re-appear quickly. in that, what's called a bailey's bead, the bright portion of the sun coming back and the contrast is so great it overpowers the corona. that's all you see. sort of like a diamond ring effect, it's called. >> so if on the ground now in casper, wyoming, it's dark. >> oh, yeah, yeah. >> you might get confused and think it's nighttime? >> well, i mean if i was a burling creature i'd start looking, where am i suppos...

Another photographer captured the entire moment in phases. i want to pay attention to two noemts just before and just after totality. totality is when the moon covers the entire disk of the sun and it creates this effect we call the diamond ring effect. you see that ring on the outside of the sun? and only a few beams of light just on the outer edges? it looks like a diamond ring if you ask me. cool stuff to see. you know what? what's not so great is what's happened on the east coast of the united states. even though the calendar says spring it looks and feels like winter in the big apple. tak...