Have you ever watched a bright full moon slowly turn a deep red color in the night sky? This magical moment is called a “lunar eclipse.”
The Moon Hides in Earth’s Shadow
A lunar eclipse happens when the Sun, Earth, and Moon line up perfectly, and Earth’s shadow falls right over the Moon.
Why Does the Moon Turn Red?
Sunlight passing through Earth’s atmosphere bends, and only the red light reaches the Moon. That’s why people sometimes call this a “Blood Moon.”
Really, It’s Every Sunrise and Sunset on Earth, All at Once
To be more precise, that red glow is made of every sunrise and sunset happening around Earth at that exact moment, bent through the atmosphere and gathered together onto the Moon. Some astronomers describe watching a lunar eclipse as seeing every sunset on Earth reflected onto the Moon all at once.
Easier to Watch Than a Solar Eclipse
A lunar eclipse can be seen anywhere the Moon is up in the night sky, and it unfolds slowly over several hours for everyone to enjoy. Unlike a solar eclipse, a lunar eclipse is completely safe to look at with your bare eyes. It’s one of the rare space events you can watch for as long as you like, no special glasses needed.
Next time the full moon turns red, remember it’s a special moment when the Sun, Earth, and Moon line up perfectly in space, and that red color is really every sunset on Earth, gathered into one glow.
Today’s Space Quiz
- When does a lunar eclipse happen?
- What’s the real reason the Moon looks red?
- Which is safe to watch with bare eyes, a lunar eclipse or a solar eclipse?
(Answers: 1. When the Sun, Earth, and Moon line up and Earth’s shadow covers the Moon. 2. Only red light bends through Earth’s atmosphere and reaches the Moon. 3. A lunar eclipse.)
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