The Umbra of Earth
It doesn't seem like such an amazing thing at first glance, I mean there are overlapped images of the moon, and some are darker because of shadows, and they look almost like eclipsed or partially full moons. But if you really sit down to think about it this is incredible. We can see the shadow of the Earth. The shadow of the Earth. An entire planet. Technically speaking this image is only the umbra, or the darker and inner shadow of the Earth. The cross section that is visible is seen most easily during a lunar eclipse, which is why these images work so well together to demonstrate the concept of Earth having not only a shadow, but a recognizable shadow we can see while on the Earth itself.
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