A vast, glowing nebula located at the center of a "protocluster" of early galaxies has baffled astronomers, considering that there had been no obvious source of such powerful light.
The "blob of gas" found by the researchers from Santa Cruz University was said to be the most dense ever seen in the early universe. Zheng Cai, a postdoctoral fellow at UC Santa Cruz, said that they found the enormous nebula in the middle of a photocluster, near the peak density.
According to RT, nebulae of this sort had been named "enormous Lyman-alpha nebula" or ELAN. It is so far the brightest, and among the largest ever to be seen in the cosmos. Only a handful has ever been observed by scientists.
ELANs are known for their shining light and had previously been attributed to the intense radiation from quasars. However, the study published in the Astrophysics journal noted that this newly discovered one, which they named MAMMOTH-1, is the first not to be associated with a quasar. This makes scientists question its bright Lyman-alpha radiation.
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