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Astronomers and pilots chased a solar eclipse across the [heaven / heavens] on Monday. This occurred while [millions / million] of people in Canada, the USA and Mexico gazed into the sky to catch a [glance / glimpse] of a rare celestial event - a [totally / total] eclipse of the sun. The sun, moon and Earth [arraigned / aligned] to block the view of the sun's disc. NASA equipped its high-altitude WB-57 planes with special sensors and instrumentation [for / to] gather information from the unique solar event. Pilots navigated [the / a] path within the eclipse, 15,240 meters high, to get a view [of / off] the corona – the sun's outer surface. NASA also fired rockets [unto / into] Earth's upper atmosphere, known as the ionosphere, to try to [unravel / rebel] some of the sun's greatest mysteries.

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