The simulation can be seen in the video below, showing the first light spreading through the darkness in a period called the epoch of reionization, around 13 billion years ago.
“Most astronomers don’t have labs to conduct experiments in. The scales of space and time are too large, so the only way we can do experiments is on computers,” said author Rahul Kannan, an astrophysicist at the Center for Astrophysics at Harvard, in a statement. “We are able to take basic physics equations and governing theoretical models to simulate what happened in the early universe.”
Because this happened so long ago, it is very difficult to observe evidence from this period. However, new telescopes like the James Webb Space Telescope will be able to see very distant galaxies — and because light takes time to travel such distances, observing these galaxies is like looking back in time. Researchers are hopeful that these newer telescopes will be able to gather data that they can compare to their simulation.
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