A celestial object that is so strong that not even light can escape

• Supernova

• White dwarf

• Nebula

• Black hole

Energy is produced in the cores of main sequence stars like our sun when

• Heavier elements undergo fusion into lighter elements

• Cosmic background radiation is absorbed

• Lighter elements undergo fusion into heavier elements

• Cosmic background radiation is released

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

NGSS.HS-PS1-8

What is revealed by the BLUE color of the supergiant star, Rigel?

• It is fairly cool

• It is close

• It is very hot

• It is no longer emitting light

Answer explanation

Blue stars are the hottest.

Tags

NGSS.HS-ESS1-3

HR diagrams are most useful for

• Locating stars

• Classifying stars

• Locating galaxies

• Classifying galaxies

The brightness of a star depends on its:

• Color and temperature

• Distance and temperature

• Distance and color

• Size and temperature

Tags

NGSS.HS-ESS1-3

Which location shows the sun, a star with average temperature and average brightness?

• A

• B

• C

• D

Why do high-mass stars skip the helium flash stage that low-mass stars go through before dying?

• Not enough hydrogen at the core.

• Once hydrogen is used up at the core the star explodes.

• Once helium is used up at the core the star explodes.

• High-mass stars never die.

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

_____ stars evolve and move off the main-sequence first; then intermediate stars & so on.

• Low-mass

• Red giant

• High-mass

• White dwarf

Tags

NGSS.HS-ESS1-3

The dividing line between high & low-mass stellar evolution is called the

• dividing line.

• main sequence turn off.

• zero-age main sequence.

• HR Diagram.

Tags

NGSS.HS-ESS1-1

NGSS.HS-ESS1-3

Close binary star systems that share stellar material can affect how each star _____.

• lives

• evolves

• functions

• interacts