Question: What is the ancient light you’re talking about in your bio?

Mark Mirmelstein answered on 6 Mar 2018:

Hi Sam and Aidan!

The primordial light I am investigating is called the cosmic microwave background radiation.
According to the standard cosmological model, the universe started from the big bang, after which it continued to expand and therefore cool down. Once the universe was cold enough, the matter and radiation in it became separate, and light was able to move freely throughout the universe, all the way until it reached our telescopes. This radiation is now visible to us in the radiowave frequencies, and is coming to us from all directions. It has a mean temperature of 2.725 Kelvin today.
Studying this radiation allows us to know more about the early universe and the structures within our universe.