https://phys.org/news/2018-06-mystery-milky-supermassive-black-hole.html

"These compact dusty stellar objects move extremely fast and close to our Galaxy's supermassive black hole. It is fascinating to watch them move from year to year," said Ciurlo. "How did they get there? And what will they become? They must have an interesting story to tell."

The researchers made their discovery by obtaining spectroscopic measurements of the Galactic Center's gas dynamics using Keck Observatory's OH-Suppressing Infrared Imaging Spectrograph (OSIRIS).