The formation of the first stars and quasars marks the transformation of the universe from its smooth initial state to its clumpy current state. In popular cosmological models, the first sources of light began to form at redshift 30 and reionized most of the hydrogen in the universe by redshift 7. Current observations are at the threshold of probing the hydrogen reionization epoch. The study of high-redshift sources is likely to attract major attention in observational and theoretical cosmology over the next decade.
Barkana, R. Loeb, A. (2001). In the beginning: the first sources of light and the reionization of the universe. Physics reports, 349(2), 125-238. doi:h10.1016/S0370-1573(01)00019-9 (arXiv)
I Paradise Lost sono una gothic band britannica fondata nel 1988. First Light è tratta dal loro dodicesimo album in studio, Faith Divides Us – Death Unites Us:
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