ASP Galaxies and Cosmology

Question 1

What is the Hubble classification system for galaxies?

Accepted Answer

A morphological classification dividing galaxies into ellipticals, spirals, and irregulars

Answer

A system based on galaxy size

Answer

A system based on galaxy luminosity

Answer

A classification based on galaxy age

Question 2

What is the cosmic microwave background (CMB) radiation?

Accepted Answer

The afterglow of the Big Bang permeating all of space

Answer

Radiation emitted by active galactic nuclei

Answer

Radiation from the sum of all stars in the observable universe

Answer

Gamma radiation from neutron star mergers

Question 3

What is Hubble's Law?

Accepted Answer

The relationship showing that galaxies recede from us at a velocity proportional to their distance

Answer

The rule that stars on the main sequence follow a mass-luminosity relationship

Answer

The classification system for galaxies based on morphology

Answer

The principle that all galaxies have supermassive black holes

Question 4

What is dark matter?

Accepted Answer

Matter that does not emit or absorb light but exerts gravitational effects

Answer

Matter composed of very cold gas clouds

Answer

Black holes distributed throughout galaxies

Answer

The matter inside stellar cores

Question 5

What is a quasar?

Accepted Answer

An extremely luminous active galactic nucleus powered by a supermassive black hole

Answer

A quasi-periodic oscillating star

Answer

A failed galaxy that never formed stars

Answer

A type of neutron star emitting radio waves

Question 6

What is the Local Group of galaxies?

Accepted Answer

The group of approximately 80 galaxies that includes the Milky Way and Andromeda

Answer

The cluster of galaxies closest to the Milky Way's center

Answer

A cluster of quasars in the nearby universe

Answer

The group of star-forming regions in our galaxy