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Book 8, Question 58 · Video

Why Does the Red Planet Have Blue Sunsets?

Video · 1:59 · Crafty Clover explains, from A Million Whys Book 8

Mars has blue sunsets because its fine dust scatters light in a different way than Earth's air! Rusty iron dust makes Mars look red. But that same fine dust scatters light so the s

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What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why does the Red Planet have blue sunsets?

The Big Idea

Mars has blue sunsets because its fine dust scatters light in a different way than Earth's air! Rusty iron dust makes Mars look red. But that same fine dust scatters light so the sky near a setting Sun glows blue. Earth's sunsets work the other way around.

Rusty Red Dust

Step one: Mars is covered in rusty dust. The soil is full of iron, which rusts red, just like an old bike left in the rain. Wind lifts the fine dust high into the sky. That dust is everywhere.

Dust Scatters Light

Step two: the dust scatters the Sun's light. The tiny dust bits bounce red light in many directions, which gives the daytime sky its butterscotch color. Near the Sun at sunset, blue light slips through the dusty air. That makes a blue glow.

Earth Is Opposite

Step three: Earth's sunsets work the other way around. Earth's air scatters blue light away, so a sunset looks orange and red. On Mars, the dust leaves blue near the Sun. Same Sun, different air.

A Closer Look

Let's take a closer look! The Sun sinks low in the Martian sky. Fine dust scatters its light. A blue glow forms around the Sun. The rest of the sky stays butterscotch.

Quick Facts

Quick facts! Mars skies look butterscotch by day. Sunsets there glow blue. Rovers have photographed Martian sunsets. Earth's sunsets are orange and red.

Think Like a Scientist

Now, think like a scientist! With a grown-up, find a rover photo of a Martian sunset. Describe its colors. Compare it with an Earth sunset. Which one surprises you more?

Outro

A red planet with blue sunsets, what a surprise! Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!

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