Science
What is An eclipse?
An eclipse happens when one space object passes into the shadow of another or blocks our view of it. A solar eclipse is when the Moon blocks the Sun; a lunar eclipse is when Earth's shadow falls on the Moon.
See it, don’t just read it.
Watch a 2-minute lesson with voice + animation that explains an eclipse.
Key things to understand
- 1Solar eclipse: the Moon passes between Earth and the Sun, blocking it.
- 2Lunar eclipse: Earth passes between the Sun and Moon, shadowing it.
- 3They happen because of the precise alignment of Sun, Earth, and Moon.
- 4Never look directly at a solar eclipse without proper protection.
Frequently asked questions
- What's the difference between a solar and lunar eclipse?
- A solar eclipse is the Moon blocking the Sun; a lunar eclipse is Earth's shadow falling on the Moon.
- Why don't eclipses happen every month?
- The Moon's orbit is tilted, so the three bodies only line up precisely a few times a year.
- Is it safe to look at a solar eclipse?
- No — never look directly without certified eclipse glasses; it can permanently damage your eyes.