ESOcast 135 - ​Why Astronomers Want to Use ALMA - ALMA​ ​is​ ​a​ ​Timemachine - HD

How can astrophysicists study the story of the Universe? Billions of years ago, when the Big Bang happened, there was no Milky Way Galaxy, no Solar System, no planet Earth and, especially, no human beings to witness these and all the events that followed. So, how would they know about this stuff?

Credit/Courtesy: ESOALMA (ESO/NAOJ/NRAO)