This argument is raised so often, yet so easily brushed aside.
FE'ers claim that a shadow object, which sometimes obscures the moon, causes lunar eclipses. RE'ers then ask, "Why doesn't this shadow object ever obscure the stars?" FE'ers then respond, "Do you watch every star in the sky and see if it has ever blanked out?"
Actually, Yes. It is estimated that there are more then 100,000 amateur astronomers in America, who spend most of their nights looking up at the sky. And many of them are looking for exactly this kind of thing.
If a star makes a sudden change in luminosity, it is usually a prelude to a supernova, and many amateurs are engaged in the popular hobby of watching stars and comparing photographs in the hopes to catch one in the act. It's a fair bet that if any star visible to the naked eye suddenly blinked out of existence, amateur astronomers all over the world would catch it immediately.
I know there are other mechanisms FE's propose to explain Lunar Eclipses that are not dependant on the shadow object, if you ascribe to one of them, this point is mute. I only want to discus this fact that seems to make the shadow object a null theory.