1. Earth is one of __________ planets in the solar system.
A) seven
B) eight
C) nine
D) ten
2. There are about __________ stars in the Milky Way.
A) 10,000 to 100,000
B) 1 million to 5 million
C) 50 billion to 100 billion
D) 100 billion to 400 billion
3. Light travels at __________ kilometers per second.
A) 1,000
B) 100,000
C) 300,000
D) 500,000
4. The Milky Way is __________ light years across.
A) 10,000
B) 65,000
C) 120,000
D) 210,000
5. Scientists think the universe is about __________ billion years old.
A) 6
B) 10.2
C) 13.8
D) 15
6. The age of the universe is based on what?
A) the age of stars
B) the distance of stars
C) the observation that all objects in the universe are moving away from each other
D) radiocarbon dating
7. Atoms and molecules that make up physical matter comprise about __________ percent of the mass of the universe.
A) 4
B) 10
C) 25
D) 90
8. Every year an estimated __________ metric tons of material from space enters Earth’s atmosphere.
A) 7
B) 15
C) 55
D) 140
9. Most of the material from space that enters Earth’s atmosphere is the size of __________.
A) sand
B) gravel
C) rocks
D) large boulders
10. Which sequence puts the solar system formation in the correct order?
A) protoplanetary disk—star development—solar system formation
B) solar system formation—star development—protoplanetary disk
C) star development—protoplanetary disk—solar system formation
D) star development—solar system formation—protoplanetary disk
11. The Sun is about __________ times the mass of Earth.
A) 300
B) 3,000
C) 30,000
D) 300,000
Answer Key
1. B
2. D
3. C
4. C
5. C
6. C
7. A
8. B
9. A
10. C
11. D
Reviews
There are no reviews yet.