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happen obscure become observe be stir fall be slow change
Astronomers and pilots a solar eclipse across the heavens on Monday. This while millions of people in Canada, the USA and Mexico into the sky to a glimpse of a rare celestial event - a total eclipse of the sun. The sun, moon and Earth to block the view of the sun's disc. NASA its high-altitude WB-57 planes with special sensors and instrumentation to information from the unique solar event. Pilots a path within the eclipse, 15,240 meters high, to get a view of the corona – the sun's outer surface. NASA also rockets into Earth's upper atmosphere, known as the ionosphere, to try to some of the sun's greatest mysteries.

A total solar eclipse when the moon the face of the sun from view. This celestial phenomenon momentarily turns day to night. Totality means the sun's corona a million times dimmer than the sun's disc. This makes it easier for scientists to and study the sun. Dr Amir Caspi, a solar astrophysicist, explained that: "Total solar eclipses let us study and see the corona in ways that just would not possible at any other time and in any other way." Solar eclipses often have confusing effects on nature. They briefly nocturnal creatures and make birds and insects silent. Motorists can also affected and should down as lighting and visibility conditions .

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