A new research suggests that the North Star is actually changing.
After dimming for the last few decades, the North Star is beginning to shine brightly again. And over the last two centuries, the brightening has become rather dramatic.
Scott Engle of Villanova University in Pennsylvania told SPACE.com that it was unexpected to find.
Engle investigated the fluctuations of the star over the course of several years, combing through historical records and even turning the gaze of the famed Hubble Space Telescope onto the star.
Scientists have known since the early 20th century that the familiar star was part of a pulsating class known as Cepheid variables; its variations were suspected as early as the mid-1800s. But unlike most Cepheid variables, the pulses of Polaris are very small.
In the early 1990s, scientists realized that the oft-lauded brightness of Polaris was beginning to decline.
Engle and his group began to research the star around the beginning of 2000, when they found that the dropping brightness was on the rise again.
Curious, the team began to search historical records to see what other measurements they could find.
Combing through data from the past century, they compared the information on Polaris with observations of other celestial bodies from the same telescopes and details about the instruments to compare the relative brightness of Polaris over the years. They found that the star had grown brighter over the past hundred years.
