Question

All of the following are true. Which of these gives evidence that quasars were more common in the early stages of the universe?

A) They are more common at very great distances.
B) They are very bright.
C) They are active galactic nuclei.
D) We don't see them in every galaxy

Answer 1

Option A) They are more common at very great distances is the evidence that quasars were more common in the early universe since we observe the universe as it was in the past when looking at distant objects.

Step-by-step explanation:

The question pertains to the evidence suggesting that quasars were more common in the early universe. The correct answer is A) They are more common at very great distances. This is because the light from quasars that is reaching us now left those objects billions of years ago, which means we are observing them as they were in the past.

Since we observe more quasars at farther distances, this implies they were more abundant during the earlier stages of the universe when looking back in time. Quasars' brilliant luminosity and their ability to outshine entire galaxies make them detectable over vast distances. Additionally, the presence of quasars in the early universe gives us valuable insights into the formation of large structures and galaxies.

Answer 2

Quasars are more common at very great distances, which serves as evidence they were more prevalent in the early universe, option A. Observing these distant quasars shows us the universe as it was billions of years ago.

Step-by-step explanation:

The evidence indicating that quasars were more common in the early stages of the universe is that they are more common at very great distances.

When we observe distant quasars, we're actually looking back in time, seeing them as they were billions of years ago. These bright centers of galaxies shine with the light of gas heated to millions of degrees as it falls into a massive black hole. Their luminosity makes them visible from extremely far away, effectively showing us a universe that is 10 billion light-years away or more, also telling us about the universe's state 10 billion years in the past.

Thus, it is option A, 'They are more common at very great distances,' that provides evidence that quasars were more common in the early universe, as it suggests that when we look further out into space (and thus further back in time), we see more quasars.