Welcome to the Quiz!
This quiz contains 9 questions from a mix of 1 subtopics.
If the Hubble constant (H0) is 70 km s-1 MPc-1, what is the estimated age of the universe?
14 billion years
5 billion years
65 billion years
2 billion years
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What is the observable universe?
the part of the universe that is visible to the naked eye
the part of the universe that we can see from Earth
the part of the universe that is beyond the reach of our telescopes
the entire universe
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According to current models, what percentage of the universe is made up of dark matter?
25%
70%
5%
95%
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What are MACHOs?
a type of dark energy
exotic particles like axions and neutralinos
massive compact halo objects like black holes and brown dwarfs
weakly interacting massive particles
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What are WIMPs?
weakly interacting massive particles
ordinary matter in dense form
a type of dark energy
massive compact halo objects
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What unexpected discovery was made about the expansion of the universe in the 1990s?
the expansion is reversing
the expansion is accelerating
the expansion is slowing down
the expansion has stopped
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What is the proposed explanation for the accelerating expansion of the universe?
gravity
dark energy
dark matter
ordinary matter
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According to the current cosmic inventory, what percentage of the universe is made up of ordinary matter?
95%
25%
70%
5%
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What are two theories on the composition of dark matter? Briefly describe each.
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