Trans-Neptunian Objects (TNOs) are those that orbit the Sun from a distance further than Neptune's orbit. Due to their distance, they suffer less space weathering, thus remaining with their physical characteristics for a longer time. Because of this, they are considered Solar System fossils. Using the Stellar Occultation technique, an astronomical event that happens when a Solar System Body passes in front of a star, we are able to determine some of the object's characteristics. The most interesting characteristics we are able to find is the presence of rings, atmosphere, binarity, or the presence of satellite. In my work, I have contributed to developing and improving the method of analysis of stellar occultations. Furthermore, I'm involved in projects to observe stellar occultations by space telescopes, like the James Webb and CHEOPS.