Lesson 6: Vocabulary

Question 1

Galactic Disk

Answer 1

Much of the matter in galaxies is found rotating around the center in a relatively flat disk

Question 2

Globular Clusters

Answer 2

A large compact spherical star cluster

Question 3

Cepheid variable star

Answer 3

Stars that get brighter and dimmer in a regular, repeating pattern

Question 4

Black Hole

Answer 4

An object that’s strong enough gravitational pull that not even light could escape

Question 5

Event horizon

Answer 5

The boundary of a black hole

Question 6

Active galaxies

Answer 6

Galaxies that are brighter than normal galaxies

Question 7

Galactic Nuclei

Answer 7

A compact region at the center of a galaxy that has a much higher than normal luminosity

Question 8

Seyfert Galaxies

Answer 8

The first active galaxies that have very bright, starlike galactic nuclei and re names after Carl Seyfert

Question 9

Quasar

Answer 9

Objects that appear like stars but are moving away from us at such high velocities

Question 10

Galaxy

Answer 10

Large group of stars