In 2019 the Nobel Prize in Physics has been awarded to Michel Mayor and Didier Queloz for the discovery of the first exoplanet around a Sun-like star. I would like to point out that the planet has not been discovered in 2019 or any year near that. 51 Pegasi b, was the first exoplanet ever found around a Sun-type star, is discovery was announced on 6 October 1995 by Mayor and Queloz, who detected it using the ELODIE spectrograph at the Observatoire de Haute-Provence in France. This discovery revolutionised astronomy, initiating an entirely new field and new instruments focused on finding and characterising exoplanets. Figure 1: Didier Queloz and Michel Mayor at La Silla Introduction Exoplanets or extrasolar planets, are planets outside the Solar System. From 1917 until 8 February 2021, has been discovered a total of 4,352 exoplanets in 3,257 systems, with 722 systems hosting more than one planet. You might ask, how do we know that planets are there? How he can detec