11.
is the search, observation and collection of data in space.
12. A meteor that reaches the Earth’s surface is called a
.
is an instrument that makes objects that are far away 13. A look closer and clearer. 14. All of the planets, their moons and other objects orbiting the Sun make up our . 15. are large rocks that can range in size from just a few centimeters up to thousands of kilometers. .
16. A meteoroid that enters the Earth’s atmosphere is called a 17. are objects sent into space to make observations and collect data which is sent back to Earth for analysis.
Review 1. What causes the alternation of day and night on Earth? 2. What causes the changes in seasons on Earth? 3.
How long does it take for: (a) the Earth to complete one rotation? (b) the Earth to complete one revolution of the Sun? (c) the moon to complete one revolution of the Earth?
4. List the planets in the solar system. Indicate which are the inner planets and which are the outer planets. 5. Why are the outer planets much colder than the inner planets? 6. List three types of satellites sent into space by people. 7. What are space probes? What do they do?
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