Question

life cycle of stars quiz
name: elise basset

1. where are protostars born?

a. star nebula
b. planetary nebula
c. supernova

1. which type of star will enter the supernova stage?

a. average mass stars
b. massive stars
c. low - mass stars

1. what is the longest phase a stars life cycle?

a. supernova
b. red giant
c. main - sequence

1. in which phase does an average sized star begin its death?

a. white dwarf
b. black hole
c. planetary nebula

1. what determines the stages of a stars life cycle?

a. its mass
b. its color
c. its brightness

1. what has a gravitational pull so strong that nothing, not even light, can escape it?

a. supernova
b. black hole
c. red supergiant

1. which gas is exhausted when stars enter the giant or supergiant phase?

a. hydrogen
b. helium
c. neon

1. what do stars that are more than 8 times more massive than the sun become after the main - sequence stage?

a. red giant
b. red supergiant
c. planetary nebula

1. what is a star called before it can fuse hydrogen into helium?

a. pulsar
b. neutron star
c. protostar

1. the sun is a main - sequence star.

a. true
b. false

1. what best describe the giant explosion that occurs when a massive star collapses and throws its outer layers out into space?

a. black hole
b. planetary nebula
c. supernova

1. which process produces an enormous amount of energy during a stars life cycle?

a. nuclear fission
b. nuclear fusion
c. radiative diffusion

1. what is the densest known object in the universe?

a. neutron star
b. black hole
c. white dwarf

1. a white dwarf is the hot core of a massive star.

a. true
b. false

Explanation:

1. Stars are born in stellar nebulae.
2. Massive stars enter the supernova stage.
3. The main - sequence is the longest phase in a star's life cycle.
4. An average - sized star begins its death in the white dwarf phase.
5. The mass determines the stages of a star's life cycle.
6. A black hole has a gravitational pull so strong that nothing, not even light, can escape it.
7. Helium is produced when stars enter the giant or supergiant phase.
8. Stars more than 8 times more massive than the Sun become red supergiants after the main - sequence stage.
9. A star is called a protostar before it can fuse hydrogen into helium.
10. The Sun is a main - sequence star (True).
11. A supernova is the giant explosion when a massive star collapses and throws its outer layers out into space.
12. Nuclear fusion produces an enormous amount of energy during a star's life cycle.
13. A black hole is the darkest known object in the universe.
14. A white dwarf is not the hot core of a massive star (False).

Answer:

1. a. stellar nebula
2. b. massive stars
3. c. main - sequence
4. a. white dwarf
5. a. its mass
6. b. black hole
7. b. helium
8. b. red supergiant
9. c. protostar
10. a. true
11. c. supernova
12. a. nuclear fusion
13. b. black hole
14. b. false