Exam 14: Modern Cosmology

Isotropic is the same as homogeneous.

Dark matter makes up 18.7% of the Universe.

If the Universe is truly flat, then what is the curvature and type of Universe?

Whether the Universe is open, closed or flat depends, on the ___________ of the Universe.

The assumption of isotropy states that

Why would a value of 500 km/s/Mpc for the Hubble constant contradict theories of stellar evolution?

The cosmological principle states that any observer in any galaxy will see the same general features of the Universe.

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

The assumption of homogeneity states that

You live in a Universe where matter dominates significantly over antimatter.

If gravity alone acts to retard the expansion and nothing acts to accelerate it, the Universe is said to be closed if I. gravity is strong enough to stop the expansion in a finite time. II. the density of the Universe is less than the critical density. III. the Universe is finite.

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

Cosmetologists are the astronomers and physicists who do research in cosmology.

How can the big bang still be found even though you may not be able to see it with your eyes? In what band of the electromagnetic spectrum has it been detected?

Antiprotons and positrons are examples of ______________, which are not ordinary matter.

If in every direction we point to a star, then the conundrum that the sky is dark is known as ___________.

If a galaxy is located at a distance of 18 Mpc and is found to have recessional velocity of 1170 km/s, what is Hubble's constant based only on this galaxy?

Space-time will be flat if

Explain why the principle of homogeneity is an important aspect of the cosmological principle.

What evidence do we have that the Universe is expanding?