... Tonight's Sky . ... News . ... New type of gamma-ray source found . Astronomers report a new type of energetic gamma-ray emitter is likely related to supersonic winds in stellar clusters. ... T he H.E.S.S. (High Energy Stereoscopic System) collaboration reports the discovery of a new type of energetic gamma-ray source, probably related to supersonic winds from massive stars in a young open stellar cluster. ... Only registered members of Astronomy.com are allowed to comment on this article. ...