What color is The Earth?

When you look up in the sky at night, you can often see the planet Mars. Mars looks like an orange-ish star in the nighttime sky. It got me to thinking, if you were on Mars, looking at the Earth, what color would Earth appear to be?

First, because Earth's orbit is inside the orbit of Mars, you would see "phases,' like we see of Venus, Mercury and The Moon. The only time you would see a "Full Earth" would be when the Moon and Earth are at opposite points in their orbits (across the Solar System from each other). And then, most of the time, the Sun would be in the way of seeing Earth from Mars. There's a cool animation of that concept here. 

In 2004, the Mars rover Spirit turned its cameras toward earth and took this picture:

This is the first image of Earth taken from the surface of another planet. Unfortunately, it's in black and white.

In orbit around Mars, the HiRISE camera on NASA's Mars Reconnaissance Orbiter took this picture of Earth and The Moon in 2007.

Here's another set of images - images of the Earth as seen from various space missions over the decades.