Why is the Sun’s corona visible only during a total solar eclipse?
Quick Answer
The corona is millions of times fainter than the Sun’s surface, so the bright photosphere normally overwhelms it.
The Full Story
The solar corona is the Sun’s outer atmosphere, stretching millions of kilometers into space. It is extremely faint compared with the brilliant photosphere, the visible surface of the Sun, so it is usually lost in glare. During a total solar eclipse, the Moon blocks the photosphere and briefly reveals the corona. This allowed astronomers to study it long before space telescopes existed. The corona was first clearly observed in detail during eclipse expeditions in the 19th century, and it remains important for understanding solar storms.
Key Facts
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"Why does the Sun have a hidden crown that appears only for minutes?"
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