A 21-hour dip could help explain Tabby's star's decade-long dimming mystery

Researchers studied Tabby’s star to explain its decade-long dimming mystery. A new study published on July 6 showed a 21-hour dip in the star’s light on Sept. 3, 2019. This signal, found using NASA’s TESS data, suggests a giant planet or brown dwarf might be blocking the star’s light.