An international team of researchers from the National Institute of Astrophysics (INAF) has observed four intermediate-luminosityred transients (ILRTs), enigmatic time-varying sources whose origin was previously uncertain. The extensive research conducted, as published in two articles in the journal Astronomy & Astrophysics, reveal that these transients are most likely actual star explosions rather than simple eruptions. The sky is continually turning on and off in all directions, with signals lasting from a few thousandths of a second to weeks, months, or years before becoming undetectable by our equipment. Many of them have been identified through analyses and investigations in recent years, but others remain unknown. The research team monitored the evolution of the four ILRT transients in order to ascertain the mechanism that generates these phenomena: are they violent eruptions from which the star survives, or are they true terminal explosions, significantly weaker than the "classic" supernovae we already know? The brightness of these specific transient sources is intermediate between two well-known phenomena: novae, violent stellar eruptions that the star survives, and supernovae, which are bright explosions in which the star is irrevocably destroyed, leaving behind a neutron star or black hole.