The discovery of a planet is generally a spectacular event. Massive telescopes scan the sky, mysterious signals are analysed, and then from out there comes a brand new world. However, when it comes to the discovery of WASP-142b, the story has quite a different beginning. It started when a 15-year-old student at Keele University, on his internship, observed a tiny drop in the light from a distant star.The boy, named Tom Wagg, was an intern with the group working on the Wide Angle Search for Planets or WASP project. According to a press release published by Keele University, Wagg identified the signal while reviewing telescope data collected as part of the survey’s routine search for planets outside the Solar System.A small signal hidden in ordinary dataThe actual hint that Wagg was able to notice was actually very subtle. He noticed a faint and temporary decrease in the luminosity of a faraway star. It turned out that such a phenomenon may occur when there is a transit of a planet that passes in front of its star relative to the position of an observer. The approach, called the transit technique, is considered one of the most widespread methods for finding planets.NASA Science provides a description of the process of finding planets by the transit technique. The astronomers look for very small and recurrent decreases in the luminosity of stars because it may suggest a transit of a planet. It has also been noted that the effect is usually so slight that scientists have to conduct multiple observations.This is exactly what made the phenomenon stand out. The signal that Wagg identified was not impressive at all; it was just a slight decrease in the brightness within a great deal of survey data.From school placement to scientific confirmationThe discovery was not confirmed overnight. According to the press release from Keele University, astronomers followed the object for about two years, making additional observations, to conclude that the dimming was caused by a planet.The planet got a name: WASP-142b. According to NASA's exoplanet database, it is a gas giant that orbits an F-type star. As it is stated by NASA Science WASP-142 b Catalogue Entry, the planet makes one complete revolution around its parent star in two days, and it was found with the method of transits.The importance of the confirmation can be explained by the fact that not all signals that seem strange are astronomical discoveries. A scientist has to make sure that the dimming happens regularly and cannot be explained by other phenomena occurring in space. According to a scientific publication by WASP-South, in which Wagg was a co-author, WASP-142b is called "a typical hot Jupiter". Why the story still resonatesOne of the contributing factors behind the appeal of this particular discovery was its straightforwardness. For instance, Wagg was not running some sort of research project or conducting studies using a large observatory. Instead, Wagg was simply a teen performing a work experience activity while analysing the information in front of him carefully.According to reports, Wagg received recognition for being the youngest person to discover an exoplanet. Specifically, the organisation stated that Wagg found the transit signal when he was working under a placement at Keele University at 15.This story can help explain how modern astronomy operates. While sky surveys may create vast amounts of data, they cannot be processed without human analysis. Scientists rely on people noticing patterns that would be missed by machines or overlooked due to time constraints. According to the NASA website on light curves, fluctuations in starlight intensity can provide important information about planets. In other words, one can use even a minimal decrease in starlight intensity to identify an entire planet.A reminder about how discoveries happenThe story does not have to be exaggerated to be interesting; its truth is powerful enough on its own. A student studying at a school discovered a slight pattern in the space-related data. Scientists took an interest in the finding and confirmed that it was really an exoplanet.This is why this story is captivating. One can clearly see from it that discoveries are not always sensational. Some of them begin with meticulous observation and patience, and with a close look at some phenomenon that is so tiny that most people do not even notice it.