![]() When our cosmos was around 380,000 years old, it cooled enough for electrons to settle onto nuclei, forming the first atoms. Things got cooler after that as the universe expanded. Naturally, all of the matter was in a completely different state: it was a plasma, with all the electrons ripped off of nuclei, like the interior of a lightning bolt or the gas within the sun. (It doesn’t really matter whether this value is in Fahrenheit, Celsius, or Kelvins-a quadrillion degrees by any measurement system is still around. The World’s Earliest StoryĪround 13.77 billion years ago, our entire visible universe-every atom, every speck of dust, every star, and every galaxy-was crammed into a volume no bigger than a peach with a temperature of over a quadrillion degrees. HERA Partnershipīut to understand why HERA is a radio telescope, we need to wind the clock back to the earliest moments in the history of our universe. ![]() ![]() HERA, the Hydrogen Epoch of Reionization Array, has more than 300 antennas. ![]()
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