Download Science 8

Science 8
Unit 2
Astronomy
Name: ______________________________
Date: ______________ Period: __________
Sec 14.2 (cont.) Stars Have Life Cycles
1.
Since astronomers can’t study a single star for billions of years, how do they know that stars go through
stages in their lives?
______________________________________________________________________________________
2.
All stars begin their lives as part of nebulas. TRUE or FALSE
3.
Describe how a star is born. _______________________________________________________________
______________________________________________________________________________________
Lifetimes of Stars:
4.
Circle the letter of the factor that determines how long a star lives.
a. mass
b. volume
c. brightness
d. temperature
5. Stars with more mass last longer than stars with less mass. TRUE or FALSE
6. Will the Sun eventually become a black hole? __________
Why or why not? _______________________________________________________________________
Deaths of Stars:
Deaths of Stars
Term
Definition
White Dwarf
7.
Supernova
8.
Neutron Star
9.
Black Hole
10.
Use the information in Life Cycles of Stars on page 465 to complete the following flowchart.
11.
Red Giant or
Nebula
12.
Small or
Medium-sized Star
14.
13.
15.
White Dwarf
Neutron Star
16. How do astronomers think our Sun may have begun? __________________________________________
_____________________________________________________________________________________
17. Because no form of radiation can ever get out of a black hole, how can astronomers detect where black
holes are? _____________________________________________________________________________
______________________________________________________________________________________
18. A distant galaxy with a very bright center is called a ________________________________________
Matching:
______19. Pulsar
a. exerts such a strong gravitational pull that no electromagnetic
______20. White dwarf
radiation can escape
______21. Nebula
b. a huge cloud of gas or dust in space
______22. Protostar
c. what an average-sized star becomes at the end of its life
______23. Supernova
d. the earliest stage of a star’s life
______24. Neutron star
e. emits pulses of radio waves
______25. Black hole
f. shines brightly in the center of a distant galaxy because of
______26. Quasar
the friction of material spiraling around it
g. formed from the leftover material after a giant star explodes,
with 3x the mass of the sun, but a diameter of only about
20 kilometers
h. an explosion that occurs at the end of a giant star’s life
Understanding Diagrams: Fill in each blank with the correct letter from the diagram
Time
A.
Gas & dust
B.
C.
D.
E.
Birth of star
______ 27. Red giant or supergiant
______2 8. Where fusion begins
______29. Part of a nebula
______30. White dwarf, neutron star, or black hole
______31. The stage our Sun is in
32. At what stage in the life cycle of the Sun will it be impossible for life to exist on Earth? ___________________
Explain. __________________________________________________________________________________