Alpha Draconis was dethroned from the role due to Earth’s wobble, which causes the night skies to shift every 26,000 years or so.
In 2004, astronomers detected small changes in brightness from Alpha Draconis, leading some to suggest the star was pulsating.
However, thanks to NASA’s incredible TESS space telescope, researchers were able to detect a second smaller star orbiting Alpha Draconis.
NASA’s TESS plays a critical role in planetary detection efforts by spotting planets flying across distant stars – a movement called a transit.
When a planet or other body transits a star, the star briefly dims and TESS can detect the differences in brightness.