How does a solar eclipse happen when the Moon is much smaller than the Sun?
Quick Answer
A solar eclipse happens because the Moon is much closer to Earth, so it can block the Sun’s disk from our view. Total solar eclipses are possible only when the sizes appear nearly matched in the sky.
The Full Story
The Sun is about 400 times wider than the Moon, but it is also about 400 times farther away, so they appear similar in size from Earth. When the Moon passes directly between Earth and the Sun at new moon, it can cover the Sun completely for observers in a narrow path. The result is a total solar eclipse, while partial or annular eclipses occur when the alignment is less exact. Eclipses have been studied for centuries and were crucial in helping scientists probe the solar corona.
Key Facts
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Suggested video title for this topic:
"Why the tiny Moon can cover the giant Sun"