How Blue Is Blue in the Sky?

Blue skies form when violet and blue light wavelengths are scattered more effectively by oxygen and nitrogen molecules in the atmosphere than longer wavelengths such as red and orange ones, which pass directly through. Rayleigh scattering is the name given to this process and it has its roots in 1871 when Lord Rayleigh first identified …

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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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