Glowing green and gold, NGC 6822, could teach us a lot about the ancient, metal-poor universe.
James Webb Space Telescope makes 1st detection of diamond-like carbon dust in the universe's earliest starsThe irregular galaxy is a known point of interest because it doesn't fit the template of galaxies with well-defined shapes. It doesn't quite resemble a spiral galaxy, such as the Milky Way, or an elliptical galaxy.
First discovered by American astronomer E. E. Barnard in 1884, it was even initially misidentified as an "exceedingly faint nebula." This confusion regarding NGC 6822 continued for several decades, with disagreements raging about its size and its brightness. These disparities arose from the fact astronomers had yet to account for how different objects would appear to different telescopes.
The debate was settled in 1925, when Edwin Hubble confirmed the existence of astronomical objects beyond the limits of the Milky Way. Hubble himself acknowledged the importance of NGC 6822 in this revelation,: "N.G.C. 6822, [was] the first object definitely assigned to a region outside the galactic system."
Until the 2000s, the most definitive work regarding NGC 6822 was a 1966 paper by Susan Kayser, who was the first woman to receive a Ph.D. in astronomy from Caltech. Now, the JWST is building on the work of Hubble and Kayser, strengthening our knowledge of our metal-poor next-door neighbor while allowing us to marvel at its beauty.
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