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Life. Probably the most fascinating thing that exists, for philosophers, poets, and of course, scientists.
Humans have always wondered if we were alone in this vast Universe. Like a puppy dog in a giant mansion, we would probably feel better if we had companions. So we started to explore by our own means, mostly by our imagination, until the invention of the telescope in the 17th century. But what information can telescopes provide us in the search of “older” extraterrestrial life? And where should we look for it?
Before answering these questions, let’s take a look at the Sun and our spaceship: the Earth. The Sun is a “mediocre” star. It is neither small nor big. It is medium-sized, a so-called ‘big dwarf’ that is neither the hottest nor the coolest. As for the Earth, we are neither too close nor too far from the Sun, the planetary equivalent of the midpoint between Ashton Kutcher and Charlie Sheen. We are where we should be for life to prosper, exisiting in the habitable zone of the Sun, like the Moon and Mars.