Earth Science - 1 Quiz 2 Retake

Hubble’s Law states that the speed at which a galaxy is moving away is proportional to the _______.

• mass of the galaxy

• number of stars in the galaxy

• galaxy’s distance from Earth

• age of the galaxy

Dark matter can be detected by its _______.

• cosmic microwave background radiation

• redshift

• velocity

• gravitational effects on visible matter

What is cosmic microwave background radiation? (Choose all that apply)

• Radiation that is present throughout the Universe

• Left-over heat (energy) from the Big Bang event

• Radiation stretched into microwave length by the expanding universe

Which of the following are required in the formation of a star?

• inertia and friction

• gravity and inertia

• gravity and fusion

• light and fusion

The life cycle of a star begins with a cloud of gas and dust called a _______.

• protoplanet

• supernova

• nebula

• protostar

Which labeled region in the diagram above identifies the Red Giant stars?

• A

• B

• C

• D

A hot, bright star would appear in which region of an H-R diagram?

• lower left

• upper right

• lower right

• upper left

Using the figure, identify which statement correctly contrasts white dwarfs with supergiants.

• White dwarfs are brighter and hotter than supergiants.

• White dwarfs are brighter and cooler than supergiants.

• White dwarfs are dimmer and hotter than supergiants.

• White dwarfs are dimmer and cooler than supergiants.

A cool, extremely bright star would be found in which region in the diagram above?

• A

• B

• C

• D

How can one star be brighter than another if they both have the same temperature?

• The brighter star is younger.

• The brighter star is red.

• The brighter star is smaller.

• The brighter star is larger.