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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.

Astronomers now speculate that a galaxy’s shape depends on all of the following except

Space-time will be flat if

Shapley found the distance to the center of the galaxy by studying the distance to open clusters.

The redshifts of the galaxies imply that the Universe is expanding and that we are at the center.

If the Universe is closed, then its age will be