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Cosmology
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Why?
Large numbers
What is the estimated number of atoms in the observable universe?
10^50
10^70
10^80
10^90
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Why?
Ultimate fate of the universe
What is the fate of an open universe with dark energy?
The universe collapses into a singularity
The universe expands forever
The universe reaches maximum entropy
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Why?
Ultimate fate of the universe
What is the Big Freeze scenario?
The universe collapses into a singularity
The universe expands forever
The universe reaches maximum entropy
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Why?
Ultimate fate of the universe
What is the current scientific consensus on the shape of the universe?
The universe is flat
The universe is closed
The universe is open
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Why?
Event horizon
What is the difference between the particle horizon and the event horizon of the observable universe?
The particle horizon is the largest comoving distance from which light emitted now can ever reach the observer in the future
The event horizon represents the largest comoving distance from which light emitted in the past could reach the observer at a given time
There is no difference between the particle horizon and the event horizon
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Why?
Dark energy
What is the cosmological constant?
A constant term that can be added to Einstein field equations of general relativity
A type of dark energy
A type of dark matter
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Why?
Dark energy
What is the most accepted premise to account for the accelerated expansion of the universe?
The universe is expanding at a constant rate
The universe is contracting
Dark energy
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Why?
Dark energy
What is dark energy?
A type of matter that is invisible to telescopes
A form of energy that affects the universe on the largest scales
A type of energy that is only present in black holes
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