A solar eclipse happens when, at just the right moment, the moon passes between the sun and Earth, NASA says. When the moon blocks only part of the sun's light, it's called a partial solar eclipse. But when the moon blocks all of the sun's light, it's a total solar eclipse.
Viewing any part of the bright sun through a camera lens, binoculars, or a telescope without a special-purpose solar filter secured over the front of the optics will instantly cause severe eye injury, NASA says.
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