What name is given to visible clouds of dust and gas in space?
Australian Aboriginal astronomy bodies and phenomena. There is a diversity of astronomical traditions in Australia, each with its own particular expression of cosmology. However, there appear to be common themes and systems between the groups. A constellation used in Aboriginal culture in Australia is the "Emu in the sky", a 'constellation' that is defined by dark nebulae (opaque clouds of dust and gas in outer space) that are visible against the Milky Way background, rather than by stars. The Emu's head is the very dark Coalsack nebula, next to the Southern Cross; the body and legs are other dark clouds trailing out along
James Webb Space Telescope of cosmic dust that scatter visible light. Observations in infrared allow the study of objects and regions of space which would be obscured by gas and dust in the visible spectrum, such as the molecular clouds where stars are born, the circumstellar disks that give rise to planets, and the cores of active galaxies. Relatively cool objects (temperatures less than several thousand degrees) emit their radiation primarily in the infrared, as described by Planck's law. As a result, most objects that are cooler than stars are better studied in the infrared. This includes the clouds of the interstellar medium, brown