The Red Spider Nebula, located some 3,000 light-years away in the constellation of Sagittarius, is a warm planetary nebula that contains one of the hottest stars known. The star’s powerful stellar winds generate 100 billion km high shock waves that sculpt the twin-lobed nebula. The waves are caused by supersonic shocks formed when the local gas is compressed and heated in front of the rapidly expanding lobes. The atoms caught in the shock emit the radiation seen in this image.
Image Credit: ESA