We have always been and always will be curious whether there are Earth-like planets somewhere in our Universe and whether there is life as we know it on these other planets as well. We have always been fascinated by the starry sky and have invested lots of time (later, also money) to investigate the frontiers that lie beyond our imagination. With the discovery of the first exoplanet - named 51 Pegasi b, which Michel Mayor and Didier Queloz announced on a conference in Florence, Italy, on 6th of October, 1995, the astrophysical revolution was born.