6. The coolest stars are those whose color is a. blue b. red c. yellow d....

6. The coolest stars are those whose color is

a. blue
b. red
c. yellow
d. white

7. A pulsar is a powerful source of radio (and sometimes light) waves thought to be coming from

a. rapidly spinning white dwarf stars
b. supernovas
c. spinning stars composed primarily of neutrons
d. ordinary stars like our Sun which happen to be more energetic than the average

8. The existence of "black holes" has been

a. verified by actual astronomical observations
b. derived from a theoretical analysis of how large stars evolve and explode
c. disproved by recent astronomical evidence
d. used to explain the formation of our solar system

9. Our Milky-way galaxy has a diameter of approximately

a. 1,000,000 miles
b. 1,000,000,000 km
c. 4 light years
d. 100,000 light years

10. Current theories indicate that our universe is composed of huge galactic cluster of stars. These clusters

a. travel randomly in all directions
b. are all moving in the same direction
c. are approaching one another due to gravitational attractive forces
d. are moving away from one another at very high speeds

Expert Solution

genius_generous answered 2 years ago

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