You may have seen one. But do you know why solar eclipses occur?
The SETI Institute's free Solar Eclipse eBook gives you the science and cosmic context behind one of nature's most jaw-dropping events. Learn more about:
Why the Moon blocks the Sun so perfectly and why this cosmic coincidence won't last forever
When an eclipse proved Einstein's General Theory of Relativity
How the element helium was discovered during an eclipse before it was found on Earth
What the corona — only visible during totality — reveals about the Sun's structure
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