EGS-zs8-1
EGS-zs8-1 is a high-redshift Lyman-break galaxy found at the northern constellation of Boötes. In May 2015, EGS-zs8-1 had the highest spectroscopic redshift of any known galaxy, meaning EGS-zs8-1 was the most distant and the oldest galaxy observed. In July 2015, EGS-zs8-1 was surpassed by EGSY8p7 (EGSY-2008532660). Description The redshift of EGS-zs8-1 was measured at z = 7.73, corresponding to a light travel distance of about 13.040 billion light years from Earth, and age of 13.04 billion years. The galaxy shows a high rate of star formation, so it releases its peak radiation at the vacuum ultraviolet part of the electromagnetic spectrum, near the Lyman-alpha emission line due to the intense radiation from newly formed blue stars, hence it is classified as a Lyman-break galaxy; high-redshift starburst galaxies emitting the Lyman-alpha emission line. Because of the cosmological redshift effect caused by the expansion of the universe, the peak light from the galaxy has become redshifted and has moved into the infrared part of the electromagnetic spectrum. The galaxy has a comoving distance of about 30 billion light years from Earth. EGS-zs8-1 was born 670 million years after the Big Bang, during the period of reionization, and it's 15 percent the size