Relying on the Keck Observatory atop Hawaii’s Mauna Kea and the effect of gravitational lensing, a group of UCLA scientists have identified what is thought to be the faintest galaxy yet seen in the earliest stages of the Universe. Discovery of the galaxy, from which light has been traveling toward us for around 13 billion years, may help astronomers resolve the question of how the neutral hydrogen gas that dominated the first few hundred millions years following the Big Bang was ionized, allowing stars to “turn on” and matter to become more complex.

 

Originally from:

http://www.dailygalaxy.com/my_weblog/2016/05/the-faintest-galaxy-of-the-early-universe-discovered-could-solve-one-of-the-biggest-mysteries-in-ast.html#more

Demonstrating light shift to determine distance and direction
Demonstrating light shift to determine distance and direction