Why don't eclipses happen every month?

Explanation:

Why do they not happen every month? A lunar eclipse occurs when the Moon enters the Earth's shadow. A solar eclipse occurs when the Moon's shadow falls on the Earth. They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth.

answer; i believe that the correct answer is (the explosion of a nearby star(supernova);

answer; is roughly two weeks;