Did Johannes Kepler Believe in Ancient Space Aliens?

Image by Ian Murray from Pixabay

Imagine creatures of “monstrous size” with “legs longer than a camel’s.” Some have wings; others have slow respiratory systems so they can stay below the water for extended periods of time. From their home on the Moon, they can watch the earth rise and set.

This seventeenth-century description is perhaps the earliest conception of extraterrestrial beings, and it comes from…