Why Total Solar Eclipses Happen: The Sun Is 400x Bigger and 400x Farther Than the Moon
The Sun is about 400 times wider than the Moon, but it's also about 400 times farther away, so the two appear almost exactly the same size in our sky. That's why the Moon can cover the Sun perfectly. And since the Moon drifts 3.8 cm farther from Earth every year, total eclipses won't last forever. SORABUMI unpacks the coincidence.