Upcoming satellite mission may 'see' how early universe cooled

During the cooling of the early universe, bubbles formed in its hot plasma, triggering gravitational waves. These space ripples could be detectable even today, a new study suggests. As the early universe cooled shortly after the Big Bang, bubbles formed in its hot plasma, triggering gravitational waves that could be detectable even today, a new study suggests. For some time, physicists have speculated that a phase transition took place in the early universe shortly after the Big Bang. More

(Source: Space.com - Apr 25)