Even with infinitely powerful telescopes, we can look back in time only until the time when
A) galaxies first formed.
B) hydrogen and helium nuclei formed.
C) stars first formed.
D) gravity split from a superforce.
E) recombination happened.

Question

Quizplus · Accepted Answer

Recombination happened about 380,000 years after the Big Bang, when electrons combined with protons to form neutral hydrogen atoms, making the universe transparent to radiation. This is the earliest time we can observe directly with telescopes, as it marks the release of the cosmic microwave background radiation.

Even with Infinitely Powerful Telescopes, We Can Look Back in Time