Lyman-alpha emission – Astronomy Now

Vast clouds of hydrogen aglow in early cosmos

1 October 2018 Astronomy Now

Vast clouds of atomic hydrogen in the early universe glow an ultraviolet blue in unexpected results indicating Lyman-alpha emissions across the entire sky.

Distant galaxies ‘lift the veil’ on the end of the cosmic dark ages

14 July 2017 Astronomy Now

Astronomers studying the distant universe have found that small star-forming galaxies were abundant when the universe was only 800 million years old, a few percent of its present age. The results suggest that the earliest galaxies, which illuminated and ionized the universe, formed at even earlier times.

A new record: Keck Observatory measures most distant galaxy

6 August 2015 Astronomy Now

EGSY8p7 is the most distant confirmed galaxy whose spectrum obtained with the W. M. Keck Observatory places it at a redshift of 8.68, at a time when the universe was less than 600 million years old. Hydrogen emission from EGSY8p7 may indicate it is the first known example of an early generation of young galaxies emitting unusually strong radiation.