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Science 8
Unit 2
Astronomy
Name: ______________________________
Date: ______________ Period: __________
Sec 14.2 Stars Change over Their Life Cycles
Part 1
Distance to Stars:
UNITS OF DISTANCE IN SPACE
Unit
Definition
Astronomical Unit
1.
Light-year
2.
3. A light-year is a unit of time.
TRUE or FALSE
Measuring Distances to Stars:
4. What is parallax? _________________________________________________________
5. To measure parallax shift, astronomers look at the same star twice, when Earth is on different sides of the
____________________.
6.
Circle the letter of what astronomers use parallax to measure the distance to.
a. distant stars
b. the sun
c. planets
d. nearby stars
Classifying Stars:
7. What are the three main characteristics used to classify stars?
a. ____________________
b. ____________________ c. ____________________
Size:
8. Stars that are much larger than the sun are called __________________ or ____________________.
9. Which kinds of stars are smaller than our sun?
a. neutron star
b. giants
c. supergiants
d. white dwarf
Color & Temperature:
10.
Color the stars below.
Color and Temperature Relationships
Below
3500° C
5000° C
6000° C
7500° C
10,000° C
3500° C
red
Above
25,000° C
orange
yellow
yellowwhite
white
bluewhite
blue
11. What reveals (shows) a star’s temperature? ____________________________________________.
12. Circle the letter of what is revealed by the red color of the supergiant Betelgeuse.
a. it is extremely hot
b. it is far away
c. it is in a constellation
d. it is a cool star
13. The hottest stars are what color? _________________________________
14. A red star is hotter / cooler than a yellow star.
15. A white star is hotter / cooler than an orange star.
16. Our sun is a ____________(color) star and is approximately __________(temperature)
Brightness:
17. To determine the true brightness of a star (it’s magnitude) astronomers must know the star’s
_________________________________________.
18. Why does Rigel shine as brightly as Betelgeuse, even though Rigel is much smaller?
___________________________________________________________________________________
19. The closer a star is to Earth, the brighter it is. TRUE or FALSE