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.
Since no one was around to observe these early universe phase transitions when they were taking place, the process is still very much shrouded in mystery. Scientists think as the hot plasma cooled down, bubbles started to form in it as part of the so-called nucleation process. Nucleation is the first step in the transition between phases when bubbles form in the original medium that act as centers of the transitioning process.
But these bubbles, scientists think, collided with each other in the transforming universe, triggering the measurable gravitational waves. It will, however, still take some time to unravel this mysterious process. LISA, a collaboration between the European Space Agency and NASA, is not expected to launch before 2037. LISA will be the first mission dedicated to recording gravitational waves, according to
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