Bizarre spiral object found swirling around Milky Way's center - Space.com
As if cracking open a cosmic Russian nesting doll, astronomers have peered into the center of the Milky Way and discovered what appears to be a miniature spiral galaxy, swirling daintily around a single large star.The star — located about 26,000 light-years from Earth near the dense and dusty galactic center — is about 32 times as massive as the sun and sits within an enormous disk of swirling gas, known as a "protostellar disk." (The disk itself measures about 4,000 astronomical units wide — or 4,000 times the distance between Earth and the sun).But astronomers have never seen one like this before: a galaxy in miniature, orbiting perilously close to the center of our own galaxy, the Milky Way.
Related: Spectacular Hubble image captures 'grand spiral' galaxy.To check this hypothesis, the team calculated a dozen potential orbits for the mysterious object, then ran a simulation to see if any of those orbits could have brought the object close enough to the protostellar disk to whip it into a spiral.—Spectacular Hubble image captures 'grand spiral' galaxy.— See a behemoth black hole and spiral galaxy like only the Hubble telescope can.Besides offering the first direct images of a protostellar disk in the galactic center, this study shows that external objects can whip stellar disks into spiral shapes typically only seen on the galactic scale. .And because the center of the Milky Way is millions of times denser with stars than our neck of the galaxy, it's likely that near-miss events like this occur in the galactic center pretty regularly, the researchers said!