Galaxies

The age of the Universe can be deduced from...

• Hubble's Law

• Kepler's 3rd Law

• The Doppler Shift Law

• The Inverse Square Law

• Shapley's Law

The study of the structure and evolution of the Universe is called...

• Anthropology

• Cosmology

• Astronomy

• Archaeology

What does it mean when galaxies, such as the Andromeda Galaxy, has a blueshift instead of a redshift (like most galaxies)?

• All nearby galaxies have a blue color

• It is moving toward us

• It is undergoing a starburst, so it has many young high-mass stars

• It contains no Cepheid variables

• It is "behind" us, expanding in the opposite direction

What is probably the end result after a collision between two galaxies?

• Complete destruction of all the stars

• Formation of a giant spiral from two elliptical ones

• Formation of a single open star cluster

• Formation of an irregular galaxy

What is meant when a galaxy is redshifted?

• Distant galaxies appear red in color due to having older stars

• The temperature of distant galaxies is decreasing

• The galaxy is moving away from us, so the wavelengths are longer

• The light from distant galaxies appear red when going through dust

Based on the galaxies found in the Local Group of galaxies, the most common type of galaxy in the Universe is probably...

• Spiral

• Barred Spiral

• Dwarf Elliptical

• Irregular

• Giant Elliptical

The most massive galaxies are

• Spiral

• Giant Elliptical

• Irregular

• Dwarf Elliptical

The brightest galaxies are...

• Spiral

• Giant Elliptical

• Irregular

• Dwarf Elliptical

Galactic cannibalism refers to...

• binary galaxies

• merging of galaxies

• galaxies drawing in gas from intergalactic medium

• the matter of galaxies getting pulled into the central black hole

An elliptical galaxy...

• evolve into an irregular galaxy when it has used up all the gas and dust

• formed from the merger of spiral galaxies

• evolve from a single spiral galaxy when the spiral has used up all its gas and dust

• become a starburst galaxy if it were to move through the hot intergalactic medium