Seeking the pale red dot

The team used optical and near-infrared spectrographs attached to telescopes at the El Roque de los Muchachos observatory in the Canary Islands to observe the light reflected from the moon during the eclipse. With the sun positioned behind Earth and the planet's shadow falling on the moon, the light reflecting off the lunar surface back to Earth first passed through the planet's atmosphere. The effect is similar to the geometry observed when an extrasolar planet passes in front of its parent star, Palle told Discovery News. so that's why the moon at times looks reddish. cool.

Before reading the whole thing my mind jumped to "Red Spectral Shift". I must say light through the upper atmosphere would never have occurred to me!