Lesson 4.3 Review

What is dark energy believed to do?

• Slow down the expansion of the universe

• Speed up the expansion of the universe

• Create new stars

• Destroy galaxies

What is the effect of the Doppler shift on sound?

• It changes the color of the sound.

• It changes the speed of the sound.

• It changes the pitch of the sound.

• It changes the direction of the sound.

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What is observed when astronomers look at light from galaxies?

• A rainbow

• A spectrum with black lines

• A solid color

• A flashing light

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What does each line in the spectrum represent for a given element?

• A specific wavelength

• A specific color

• A specific temperature

• A specific sound

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Who estimated the distances to distant galaxies?

• Albert Einstein

• Edwin Hubble

• Isaac Newton

• Galileo Galilei

What elements could the early universe only make according to the expansion theory?

• Hydrogen and helium

• Carbon and oxygen

• Iron and nickel

• Gold and silver

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What is dark matter?

• A type of visible matter

• An invisible form of matter

• A type of energy

• A form of light

What is the role of fusion in the universe?

• It cools down stars

• It produces heavier elements

• It creates black holes

• It destroys galaxies

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In what year was the cosmic microwave background radiation discovered?

• 1955

• 1965

• 1975

• 1985

What did Penzias and Wilson notice while researching something else?

• A bright light in the sky

• A strange signal picked up by their radio telescope

• A new planet

• A black hole

Tags

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