1. All stars and planets in the universe began as small clouds of:
A. water and rocks
B. ice and snow
C. dust and gas

2. The formation of asteroids took place when our solar system was generated.
A. True B. False

3. Some craters on Earth’s surface like the one found in Arizona formed through the impact of a planetesimal.
A. True B. False

4. A type of rocky meteorite that hasn’t melted completely and has fallen to Earth’s surface is called:
A) Chondrites B) Achondrites C) Siderites

5. The _____ meteorite that ever fell to Earth landed in _____ at about _____ years ago.
A) smallest, Eastern Europe, 10 million
B) largest, Mexico, and one million
C) largest, Africa, and 80,000
D) smallest, China, and 100,000

6. Most ______ formed at about ______ years ago at the birth of our solar system.
A) photons and 1 million
B) of Saturn’s moons and 10 billion
C) meteorites and 4.5 billion
D) of our moon’s craters and 2.5 million

7. 60Fe is the daughter product of radioactive decay from 60Ni
A) True B) False

8. Once you have the makings of a star, the next step in solar system formation includes the development of atmospheres for planets.
A) True B) False

9. Since meteorites with supernova dust have been discovered, it is known that a violent explosion rocked our cosmic neighborhood at the time of our solar system’s birth.
A) True B) False

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Planet Earth: Department of Earth and Planetary Sciences, spring