Eclipses
7 questions tagged Eclipses — spanning every one of the seven Ws.
Why is there a solar eclipse only sometimes?
Eclipses need the Sun, Moon, and Earth to line up just right, and the Moon’s orbit is tilted about 5 degrees, so perfect alignment is rare.
How does a solar eclipse happen when the Moon is much smaller than the Sun?
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.
Why do solar eclipses look so perfectly sized from Earth?
The Moon is about 400 times smaller than the Sun but also about 400 times closer, so they appear nearly the same size in the sky.
Why are solar eclipses such a close apparent match in size between the Sun and Moon?
The Sun is about 400 times larger than the Moon but also about 400 times farther away, so they appear nearly the same size in our sky.
Why does the Moon sometimes look red during a total lunar eclipse?
Earth’s atmosphere bends and filters sunlight, sending red light into Earth’s shadow and onto the Moon.
Why do solar eclipses happen only at certain times?
Because the Moon’s orbit is tilted by about 5 degrees, so its shadow usually misses Earth.
How does a lunar eclipse happen?
A lunar eclipse happens when Earth moves directly between the Sun and the Moon, casting Earth’s shadow on the Moon. It can only occur at full moon and only when the alignment is just right.