Contemporary Photos

Do planets cast shadows?

Yes. As has been pointed out when the Moon is eclipsed, that is the Earth's shadow. The Earth's shadow can also been seen from many vantage points during reasonably clear sunsets. Wait till the sun just goes down, and the horizon is pink all around (the Belt of Venus.) As the light continues to fade, the pink area will dim, but below it to the west a dark shadowed area will begin the rise. As the light fades you can actually see the shadow of the earth rising as the sun gets further below the horizon, you've likely seen it many times but didn't realize what it was:

http://www.atoptics.co.uk/atoptics/earshad.htm
http://www.galaxyimages.com/earthshadow.html

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