Unit 9

Question 1

The ________ star is extremely luminous and emits a lot of energy in a short amount of time.

Answer 1

Quasar

Question 2

When infinite gravitation and density is all bunched together at one point, it is a phenomenon called ________.

Answer 2

singularity

Question 3

In a(n) _________, electrons are cramped and can’t circulate freely.

Answer 3

white dwarf

Question 4

If _____________ exists, it constitutes 90% of all existence.

Answer 4

dark matter

Question 5

When their fuel source runs out, quasars become ____________.

Answer 5

ordinary galaxies

Question 6

A(n) ___________ stretches across the entire cosmos in chains and sheets of clusters that are linked by gravity at their edges.

Answer 6

supercluster

Question 7

A(n) _____ shift occurs when a light source, such as a star or quasar, recedes from an observer at a significant percentage of light speed.

Answer 7

red

Question 8

____________ are in a state of existence where physical laws do not apply and they are a mystery because they are unobservable from the outside.

Answer 8

Black holes

Question 9

Shrinkage to the point where electrons merge with protons and there is no empty space characteristics of a(n) _________.

Answer 9

neutron star

Question 10

All _____________ are powered by _______ falling into black holes.

Answer 10

active galaxies, matter

Question 11

As extreme conditions in the cores of dying stars alter ordinary matter it forms ______________.

Answer 11

degenerate matter

Question 12

____________ are detected by ________ when nuclei are broken apart.

Answer 12

singularities, x-rays

Question 13

The greater an object’s distance, the greater the ____________ speed.

Answer 13

recession

Question 14

Light from a(n) _______________ comes from its exceptionally bright nucleus, within which large amounts of very ionized gas surges.

Answer 14

seyfert galaxy

Question 15

Unexpectedly high rotation speeds indicate that regions that contain longer orbits enclose more ________.

Answer 15

mass

Question 16

Our Local Group is moving toward a supercluster known as the ________________.

Answer 16

great attractor

Question 17

__________________ occur(s) when electrons from ionized matter spiral around magnetic lines of force that surround a black hole.

Answer 17

synchrotron radiation

Question 18

____________ is the act of growing by being added to.

Answer 18

accretion

Question 19

______________ is a(n) spiral-shaped ____________ moving through the galactic disk.

Answer 19

density wave, disturbance

Question 20

Dust must be considered when estimating __________ in space.

Answer 20

distance

Question 21

Spiral galaxies are classified by what?

Answer 21

the degree of openness of the arms and size of the nuclei

Question 22

What is it called when the universe is seen as an orderly system?

Answer 22

cosmos

Question 23

The void between chains and clusters are called _________.

Answer 23

“bubbles”

Question 24

What reveals itself with the presence of very hot, rapidly moving, low-density gas in the galaxy’s halo?

Answer 24

dark matter