the-atmosphere

Why is the Sky Blue?

When sunlight reaches Earth’s atmosphere, it bounces off of molecules. The air molecules scatter light — just like billiard balls do when they collide. The shorter the wavelength of the light, the more it gets scattered. This is why the sun’s light looks blue. Sky Blue Is Due to Rayleigh Scattering Sky blue is a

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The Planet in Space

Mars is a rocky planet that orbits our Sun, a star. Like Earth, it has clouds, winds, seasons, polar ice caps, volcanoes and canyons. It also has two moons: Phobos, an inner moon, and Deimos, an outer one. Both are pockmarked with craters from meteor impacts. The Red Planet Mars is the next planet out

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