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Key Terms
The hidden-word puzzle below contains 12 key terms from the chapter. You might find themacross, down, or on the diagonal.
Use the clues to identify the hidden terms. Then circle each term in the puzzle.
Clues Key Terms
1. The spinning motion of Earth around its axis ________________________
2. The study of the moon, stars, and other objects in space ________________________
3. The different shapes of the moon you see from Earth ________________________
4. The imaginary line that passes through Earth’s center and
the North and South poles ________________________
5. The two days of the year on which the sun is directly overhead
at either 23. 5....north or south ________________________
6. Earth’s path as it revolves around the sun ________________________
7. The movement of one object around another object ________________________
8. The rise or fall of ocean water ________________________
9. A round pit on the moon’s surface ________________________
10. The darkest part of the moon’s shadow ________________________
11. Dark, flat areas on the moon’s surface ________________________
12. The part of a shadow that surrounds the darkest part ________________________
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Key Terms
Match each definition in the left column with the correct term in the right column.
Then write the number of each term in the appropriate box below. When you have filled all the boxes, add the numbers in
each column and row. All of the sums should be the same.
Definitions Terms
A. the reaction force that propels a rocket forward
B. an object that revolves around another object in space
C. a place that is empty of all matter
D. speed in a given direction
E. a large artificial satellite in which people live and work
F. indirectly acquiring information about Earth’s surface
G. an item used on Earth, but developed for use in space
H. spacecraft that has scientific instruments but no human crew
I. the velocity a rocket must achieve to establish an orbit
1. velocity
2. space probe
3. vacuum
4. satellite
5. remote sensing
6. space spinoff
7. orbital velocity
8. thrust
9. space station
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Key Terms
Clues
Answer the questions by writing the correct key terms in the blanks. Use the circled letters to
find the hidden key term. Then write a definition for the hidden key term.
1. What is the name of the sun’s surface layer?
__ __ __ __ __ __ __ __ __ __ __
2. What is an elongated circle, or oval shape, called?
__ __ __ __ __ __ __
3. What are the objects called that orbit the sun in a belt between
Mars and Jupiter?
__ __ __ __ __ __ __ __ __
4. What is the trapping of heat by the atmosphere?
__ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __
5. What is a description of the solar system in which all the
planets revolve around
Earth?
__ __ __ __ __ __ __ __ __ __
6. What is a chunk of rock or dust in space called?
__ __ __ __ __ __ __ __ __
7. What are reddish loops of gas that connect different parts
of sunspot regions?
__ __ __ __ __ __ __ __ __ __ __
8. What are areas of gas on the sun that are cooler than the gases
around them?
__ __ __ __ __ __ __ __
9. What is a stream of electrically charged particles sent out
by the corona called?
__ __ __ __ __ __ __ __ __
10. What is the outer layer of the sun’s atmosphere?
__ __ __ __ __ __
Key Term: __ __ __ __ __ __ __ __ __ __ __ __
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Key Terms
Solve the clues by filling in the blanks with key terms from the chapter. Then write the numbered
letters in the correct order to find the hidden message.
Clues Key Terms
1. The earliest stage of a star’s life __ __ __ __ __ __
__ __ __
2. An object with gravity so strong nothing can escape __ __ __
__ __ __ __ __ __
3. An instrument that breaks the light from an object into
colors __ __ __ __ __ __ __ __ __ __ __ __
4. All of space and everything in it __ __ __ __ __ __ __ __
5. The small, dense remains of a high-mass star __ __ __ __ __
__ __ __ __ __ __
6. The explosion that formed the universe __ __ __ __ __ __ __
7. A pattern of stars in the sky __ __ __ __ __ __ __ __ __ __
__ __ __
8. The explosion of a dying giant or supergiant star __ __ __
__ __ __ __ __ __
9. A galaxy that has a pinwheel shape __ __ __ __ __ __ __ __
__ __ __ __
10. A building that contains one or more telescopes __ __ __ __
__ __ __ __ __ __ __
11. A device used to detect radio waves from objects in
space __ __ __ __ __ __ __ __ __ __ __ __ __ __
12. The apparent change in position of an object when you
look at it from different places __ __ __ __ __ __ __ __
13. A distant galaxy with a black hole at its center __ __ __
__ __ __
Hidden Message
__ __
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