How do we know the shape of the universe?
A) By observing distant stars during eclipses of the sun.
B) By triangulation measurements involving the distances to the sun and to the moon.
C) From the comparison between the pulsations coming from distant neutron stars.
D) By observation of the angular size of a typical wavelike disturbance in the cosmic microwave background.
E) By observing the light from distant stars and one star passes in front of another star.

Question

Quizplus · Accepted Answer

The shape of the universe is inferred from the cosmic microwave background radiation, specifically by observing the angular size of fluctuations in this radiation, which provides information about the universe's geometry.

How Do We Know the Shape of the Universe