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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

The inflationary theory of the Universe may explain why the background radiation is so isotropic.

The Local Group of galaxies is dominated by the presence of spiral galaxies.

If matter and antimatter combine, the result is energy.

The ___________ view of the Universe is that it is eternal and unchanging.

A solar or lunar eclipse will occur

The sky is flat, like a sheet of paper, and hence angular diameter is the distance measured along that flat sheet of paper.