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Image Astro du jour
Imagine for a moment you are lying back, gazing up at the red-orange celestial clouds in today’s Picture of the Week. What shapes do you see? A chicken pecking seeds on the ground, the head of a dragon, or something else entirely?
These pareidolia-inducing clouds are a pair of nebulae — collections of dust and gas in interstellar space — called Gum 10 and Gum 11. Visible mostly from the southern hemisphere, they are part of a larger complex, in which stars are born. Gum 10 is the brightest cloud that occupies most of the image, whereas Gum 11 is the fainter, detached cloud to the bottom-left. Their bright glow comes from a special interaction between hydrogen and the hot massive stars in each nebula. These stars emit ultraviolet light, which has enough energy to tear electrons away from their atoms, forming ions. These electrons eventually recombine with hydrogen ions, which causes the emission of the specific shade of red light seen in this image. The black lines in the nebula come from dust that blocks the light behind it.
This image was taken with the VLT Survey Telescope (VST), which celebrates the 15th anniversary of its first light today! The VST project was a joint venture between ESO and the Capodimonte Astronomical Observatory (OAC), part of the Italian National Institute for Astrophysics (INAF). Today the VST is solely managed by INAF and is hosted by ESO at its Paranal Observatory in Chile. The data behind this picture comes from a project called VPHAS+, which uses the VST to scan across the plane of our Milky Way galaxy, intended to better understand the lifecycle of stars.