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

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

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

The CMB is perfectly uniform.

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

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

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

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

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

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