The center of our galaxy is located in the direction of the constellation of Orion.
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The elements hydrogen and helium were made during the first…
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…
The night sky is dark because the Universe is not infinitely old.
Astronomers now speculate that a galaxy’s shape depends on a…
Astronomers now speculate that a galaxy’s shape depends on all of the following except
Space-time will be flat if
Space-time will be flat if
Shapley found the distance to the center of the galaxy by st…
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 exp…
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
If the Universe is closed, then its age will be
The inflationary theory of the Universe may explain why the…
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…
The Local Group of galaxies is dominated by the presence of spiral galaxies.