According to the dominant scientific hypothesis today, around 13.8 bln years ago there occurred the tremendous event dubbed the Big Bang which created our universe. It is likely that incredibly powerful gravity waves compressed primary gas into gigantic clumps while unrelenting gravity forces ignited thermonuclear fire in their depths, thus lighting the universe with the first stars. These forces also grouped the stars into large-scale clusters, which were later to unite into yet more complex structures of colossal proportions. Billions of years later, one of them became the cradle of an amazing phenomenon – life. And even though mankind is still confined to our native system, we have found out a lot about our own galaxy. What is it that we already know about the Milky Way?