... Gravitational wave search provides insights into galaxy evolution and mergers . ... Cosmic Adventures . ... Distant galaxies reveal clearing of the cosmic fog . By carefully studying some of the most distant galaxies, scientists have been able to establish a timeline for reionization for the first time. ... This artistт??s impression shows galaxies at a time less than a billion years after the Big Bang, when the universe was still partially filled with hydrogen fog that absorbed ultraviolet light. ...