Science, Space and Technology News 2024
This Hubble Space Telescope image showcases the spiral galaxy IC 4633, located in the constellation Apus, 100 million light-years away. Credit: ESA/Hubble & NASA, J. Dalcanton, Dark Energy Survey/DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA, Acknowledgment: L. Shatz
The spiral galaxy IC 4633, revealed by Hubble, is intertwined with the dark nebula of the Chameleon region and the enigmatic South Celestial Serpent, showcasing a captivating astronomical tableau. In this week’s Picture of the Week from Hubble, the subject is the spiral galaxy IC 4633, located 100 million light-years away from us in the constellation Apus. IC 4633 is a galaxy rich in star-forming activity, as well as hosting anat its core. From our point of view, the galaxy is tilted mostly towards us, giving astronomers a fairly good view of its billions of stars.
However, we can’t fully appreciate the features of this galaxy — at least in visible light — because it’s partially concealed by a stretch of dark dust. This dark nebula is part of the Chameleon star-forming region, itself located only around 500 light-years from us, in a nearby part of thegalaxy. The dark clouds in the Chameleon region occupy a large area of the southern sky, covering their namesake constellation but also encroaching on nearby constellations, like Apus.
The cloud overlapping IC 4633 lies east of the well-known Cha I, II, and III, and has been called MW9 or the South Celestial Serpent. A vast, narrow trail of faint gas that snakes over the southern celestial pole, it’s much more subdued-looking than its neighbors. It’s classified as an integrated flux nebula — a cloud of gas and dust in the Milky Way galaxy that’s not near to any single star, and is only faintly lit by the total light of all the galaxy’s stars.
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