Ch. 22 Lesson 3 Quiz Review

All stars die in different ways, depending on their ______________.

• composition

• temperature

• mass

• color

All stars form in a cloud of gas and dust called a nebula.

• True

• False

How does a protostar become a visible star?

• the protostar continues to pull in surrounding gas

• the protostar heats the gas and dust

• the protostar contracts and expands and then gets large enough to be a visible star

• nuclear fusion heats the gas and dust and then pushes it out into space leaving the protostar as a visible star

Tags

NGSS.HS-ESS1-1

What happens to the leftover gas and dust after a protostar becomes a visible star?

• it is pushed out into deeper space

• it evolves into a supernova

• it gets absorbed into another protostar

• it might be used later to create planets

Where do most stars exist during their lives?

• in nebulas

• on the main sequence

• on the Hertzsprung-Russell diagram

• in supernovas

When does a star become included on the main sequence?

• when it begins to fuse hydrogen to helium

• when it runs out of hydrogen

• when it begins nuclear fusion

• when it reaches a certain mass

Tags

NGSS.HS-PS1-8

About how long do lower-mass stars stay on the main sequence?

• thousands of years

• millions of years

• billions of years

• forever

About how long do high-mass stars stay on the main sequence?

• thousands of years

• millions of years

• billions of years

• forever

Why do high-mass stars stay on the main sequence for a less amount of time than low-mass stars?

• their mass is too large to be included

• their temperature is hotter than average stars

• they fuse helium at a much faster rate

• they fuse hydrogen at a much faster rate

When does a star leave the main sequence?

• when it begins nuclear fusion

• when its hydrogen supply is gone

• when its helium supply is gone

• when it reaches a certain mass