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What is an eclipse?
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Quick answer
An eclipse happens when one space body passes into the shadow of another, or blocks it from view. A solar eclipse occurs when the Moon passes between Earth and the Sun; a lunar eclipse when Earth's shadow falls on the Moon.
Key things to understand
- It's an alignment where one body blocks or shadows another.
- Solar eclipse: the Moon blocks the Sun from part of Earth.
- Lunar eclipse: Earth's shadow falls across the Moon.
- They happen only when Sun, Earth, and Moon line up closely.
- A total solar eclipse briefly turns day to twilight.
People also ask
What's the difference between a solar and lunar eclipse?
In a solar eclipse the Moon blocks the Sun; in a lunar eclipse Earth's shadow falls on the Moon, often turning it reddish.
Why don't eclipses happen every month?
The Moon's orbit is tilted, so the Sun, Earth, and Moon only line up precisely enough a few times a year.
Why is it dangerous to look at a solar eclipse?
The Sun's intense light can permanently damage your eyes; you need special eclipse glasses, not ordinary sunglasses.
Is it safe to look at a solar eclipse?
No — never look directly without certified eclipse glasses; it can permanently damage your eyes.