Recent observations of the globular cluster NGC 6397, utilizing the Euclid Space Telescope, have led to the unexpected discovery of a brightness gap among M-dwarfs, termed the Jao gap. This gap indicates a lower-than-anticipated population of M-dwarfs at a specific brightness level, suggesting a transition in stellar properties as stars evolve. The Jao gap appears near the luminosity-temperature regime where M-dwarfs shift from fully convective to having a radiative zone, which occurs around 0.35 solar masses. The research, led by Massimo Griggio from the Space Telescope Science Institute, highlights the importance of using advanced data-reduction tools to improve observational precision in densely packed stellar environments. The findings not only provide insights into stellar evolution but also offer constraints on the distance and metallicity of NGC 6397, establishing a new benchmark for understanding stellar populations in globular clusters. This study underscores the potential of the Euclid Space Telescope in unraveling complex astrophysical phenomena.