X-ray telescopes have captured the earliest and clearest view of the core of a gas cloud about to transform into a star. Most intriguing to astronomers is evidence suggesting that some force other than gravity is hastening the transition.
The X rays from the cloud, known as a class 0 protostar, mark the first clear detection of high-energy radiation from such an early stellar precursor. To produce the X rays, the infalling gas within the protostar must be fast moving and extremely hot.
"This is no gentle freefall of gas," notes Michael Corcoran of NASA's Goddard Space Flight Center in Greenbelt, Md.