The molecular cloud known as W51 is one of the closest to Earth at a distance of 17,000 light years. Giant molecular clouds, containing mostly hydrogen are where most new stars and planets form. The Chandra X-ray observatory observed this cloud in a long exposure lasting 20 hours. About 600 stars have been detected as well as diffuse interstellar gas with a temperature of millions of degrees. The gas is probably heated by supernova. The stars emit X-rays from an envelop a hot gas of millions of degrees (the seller corona). Th faster the rotation of the star the stronger the radiation on X-rays suggesting a dynamo effect.

For more information please read http://chandra.harvard.edu/photo/2017/w51/