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The rapid fluctuations of quasars show that the energy emitting portions of these objects must be very small.

The deuterium and lithium-7 in distant quasars and in the interstellar medium suggests that the Universe is open.

Younger stars have more heavy elements because

The CMB is perfectly uniform.

WIMPs are an example of baryonic matter.

Soon after discovery, it was observed that quasars had a starlike appearance which was blurred by Earth’s atmospheric “seeing”. Despite the blurring, it was realized that the intense energy-emitting regions of quasars must be small because they

A center or an edge of the Universe would be a special place, contradicting the cosmological principle.

The center of our galaxy is located in the direction of the constellation of Orion.

The elements hydrogen and helium were made during the first few minutes after the big bang.

The night sky is dark because the Universe is not infinitely old.