Today I recieved a link from a friend of mine today regarding a speech that astronomer Carl Sagan gave back in 1994 comparing our world to the vast expanse of the universe.
Here is a photo of Earth from many billions of miles away, taken by Voyager 1 in 1990, shown in his presentation:
Aside from Carl’s points, I also think this photo demonstrates how easy it would be for humans to miss another potentially advanced culture, seeing that our world can be so easily missed amoung the vast emptyness that is space.
Ever wonder how many alien civilizations are out there? Read up on the Drake Equation, it’s an interesting way to quantify the uncertainty of the factors which determine the number of extraterrestrial civilizations that we have a chance at coming into communication with.