Agence France-PresseJune 12, 2013 10:31
An intriguing stellar cluster located 7,000 light years from Earth has prompted astronomers to create a new class of stars with "pulsating" brightness, the European Southern Observatory (ESO) said on Wednesday.
Sky-watchers made the discovery over seven years of patient measurements of 3,000 stars in a cluster called NGC 3766, found in the constellation of Centaurus.
Unexpectedly, 36 of these stars had tiny variations in their normal brightness, they found.
The luminosity varied by just 0.1 percent, with the changes occurring at periods ranging from two to 20 hours.