In our best current theory, the first quasars formed about:
A)14.5 billion years ago.
B)13 billion years ago.
C)12 billion years ago.
D)11 billion years ago.
E)9 billion years ago.

Question

Quizplus · Accepted Answer

The first quasars are thought to have formed around 13 billion years ago, near the beginning of the universe's reionization period. This is supported by observations of high-redshift quasars, which are currently the most distant and therefore the oldest known quasars, with redshift values indicating that they are around 13 billion years old.

In Our Best Current Theory, the First Quasars Formed About