As we look at more distant regions of space,we see the regions as they existed at earlier times,but our farthest views are blocked by a "wall" beyond which the universe is opaque.What event occurred at the time marked by this wall?

Question

Quizplus · Accepted Answer

The event that marked the "wall" beyond which the universe is opaque was the combination of electrons and protons to form neutral hydrogen atoms, which occurred about 380,000 years after the Big Bang. This is known as recombination, and it resulted in the release of cosmic microwave background radiation that we can still observe today. Beyond this point, the universe became transparent to light, allowing it to travel freely through space and allowing us to observe more distant regions of the cosmos.

As We Look at More Distant Regions of Space,we See