Several nebulae make up this image, three of which form the large Seagull Nebula in the top centre, while a fourth in the bottom right is known as the Duck Nebula or Thor’s Helmet. The emission from the Duck Nebula comes from hundreds of solar masses’ worth of ionised gasses being pushed away and irradiated by a massive hot star thought to be on the verge of exploding as a supernova. The Seagull’s head is also composed of ionised gas, although here the gas is irradiated by a binary system of two massive young stars. Finally, the large wings of the Seagull consist of a vast cloud of hydrogen gas, which is from the Milky Way’s spiral arms and is lit up by young stars formed within the cloud.