ES Review 2nd Sem Final

The largest grouping of stars bound by gravitational attraction is called a(n)

• cluster.

• galaxy.

• system.

• constellation.

An open cluster has a loose shape, over a hundred stars and is generally found near

• the center of a spiral galaxy.

• the center of a elliptical galaxy.

• the arms of a spiral galaxy.

• the arms of a elliptical galaxy.

Our local group of Galaxies contains _______ galaxies within a five million light years radius.

• 7

• 10

• 15

• 30

A group of stars that has no particular shape and tends to be low in mass and rich in dust and gas is a(n)

• Barred Spiral Galaxy.

• Elliptical Galaxy.

• Irregular Galaxy.

• Spiral Galaxy.

A group of stars that contains a center, of bright stars from which two or more arms radiate outward is a(n)

• Barred Spiral Galaxy.

• Elliptical Galaxy.

• Irregular Galaxy.

• Spiral Galaxy.

We can detect Dark Matter from its

• light.

• mass.

• gravity.

• shadow.

What is important about Hubble’s discovery that there is a red shift in the spectra of galaxies?

• It suggests that the universe is expanding.

• It suggests that the universe is contracting.

• It proves the big bang theory.

• It suggests the existence of black holes.

Material that does not give off light but has detectable gravity is

• dark matter.

• big bang theory.

• dark energy.

• cosmic background radiation.

The theory that all matter and energy was compressed into a small volume and then exploded and began expanding is

• dark matter.

• big bang theory.

• dark energy.

• cosmic background radiation.

The process that fuels stars is

• burning.

• nuclear fission.

• nuclear fusion.

• photosynthesis.