This photo explains a lot about the early universe.
, “NGC 6822 is an excellent observational target as its position on the sky is such that it can be observed from both the northern and the southern hemisphere. Its modest distance allows many multi-band investigations ranging from the optical to the near-infrared and to the mid-infrared .
That last sentence is worth homing in on. NGC 6822 has low metallicity, which means that it includes low proportions of elements other than hydrogen and helium. Elements beyond H and He — all other known elements — are primarily produced by stars throughout their lifetimes. This makes NGC 6822 an interesting region for understanding more about the nature of the early universe when there was not much metal content present.
“N.G.C. 6822, [was] the first object definitely assigned to a region outside the galactic system,” Hubble explained. Hubble’s work was vital in expanding humanity’s understanding of the universe. At the time, it was far from settled science that there even were objects beyond the Milky Way.
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