Tabby’s Star (KIC 8462852) (2015)

Tabby's Star (KIC 8462852), discovered in 2015, baffles astronomers with its irregular, dramatic dimming patterns unlike any known stellar behavior. Dips of up to 22% in brightness - far exceeding normal planet transits - sparked theories ranging from swarms of comets to alien megastructures. Located 1,470 light-years away in Cygnus, this F-type main-sequence star shows long-term fading unexplained by standard astrophysics. While dust particles likely cause the dimming, its exact mechanism remains unsolved, making it one of space's most intriguing mysteries that continues to challenge our understanding of stellar phenomena.