Missing Mass Problems

Dark matter is a theoretical substance. What does this mean?

• Scientists have simply guessed that it exists

• There is evidence for its existence, but it hasn't been proven

• Scientists are certain that it exists

• Scientists are split 50/50 over whether it exists or not

An object's gravity depends on its:

• mass

• density

• volume

• weight

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What caused Fritz Zwicky to come up with the theory of dark matter?

• He saw a galaxy cluster moving away from earth at a rapid rate of speed

• He saw a galaxy cluster moving toward earth at a rapid rate of speed

• He saw a galaxy cluster breaking apart at a rapid rate of speed

• He saw a galaxy cluster revolving at a rapid rate of speed

If you increase the mass of a star, what will the planets orbiting it do?

• They will speed up

• They will slow down

• They will move toward the star

• They will move away from the star

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How can we detect dark matter?

• With telescopes

• With a radio waves

• Indirectly, through its effects

• With electromagnetic radiation

What question is behind the missing mass problem?

• Why galaxies seem to be more massive than observable data suggests

• Why galaxies seem to be less massive than observable data suggests

• Why certain stars appear more massive than observable data suggests

• Why certain stars appear less massive than observable data suggests

Why does gravitational lensing occur?

• Light speeds up when it encounters massive objects

• Light slows down when it encounters massive objects

• The gravity of massive objects bends light

• Extremely bright or extremely dark objects cause optical illusions

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How would dark matter be different from the stars and planets we can see?

• It wouldn't reflect light

• It wouldn't emit radiation

• It wouldn't interact with the electromagnetic spectrum

• All of these

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What is a neutrino?

• A type of very small particle

• A type of black hole

• A type of neutron star

• A very dense type of galaxy

Which of the following is true of black holes?

• They are composed of neutrinos

• They are extremely dense

• Only light can escape their gravity

• Scientists agree that they are sources of dark matter