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___________ galaxies contain large clouds of gas and dust, b…

___________ galaxies contain large clouds of gas and dust, both young and old stars, but have no obvious spiral arms or nucleus.

Published May 9, 2021
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Getting a cold is like building the chemical elements in nuc…

Getting a cold is like building the chemical elements in nucleosynthesis.

Published May 9, 2021
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The rapid fluctuations of quasars show that the energy emitt…

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

Published May 9, 2021
Categorized as Uncategorized

The CMB is perfectly uniform.

The CMB is perfectly uniform.

Published May 9, 2021
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Elliptical galaxies contain more gas, dust, and young stars…

Elliptical galaxies contain more gas, dust, and young stars than do Sa galaxies.

Published May 9, 2021
Categorized as Uncategorized

A center or an edge of the Universe would be a special place…

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

Published May 9, 2021
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For a galaxy to be active, the supermassive black hole needs…

For a galaxy to be active, the supermassive black hole needs to have matter flow into it.

Published May 9, 2021
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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.

Published May 9, 2021
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The units of proper motion are km/s because proper motion is…

The units of proper motion are km/s because proper motion is the motion of stars across the sky.

Published May 9, 2021
Categorized as Uncategorized

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

Published May 9, 2021
Categorized as Uncategorized

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