The idea of inflation makes one clear prediction that, until the discovery of an accelerating expansion, seemed to contradict the available observations. What is this prediction?
A) The universe should be geometrically "flat" (in the four dimensions of spacetime).
B) Inflation predicts that the early universe should have regions of enhanced density that could have acted as "seeds" for the formation of galaxies and large structures.
C) Inflation predicts that the temperature of the cosmic microwave background should be almost (but not exactly) the same everywhere.
D) Inflation predicts that the entire universe must be far larger than the observable universe.

Question

Quizplus · Accepted Answer

The prediction of inflation is that the universe should be geometrically "flat" (in the four dimensions of spacetime). This means that if we draw a triangle with sides defined by any three points in the universe, the angles of the triangle should add up to 180 degrees, just like in Euclidean geometry. This contradicted previous observations that suggested the universe was curved, but subsequent measurements have confirmed the prediction of inflation that the universe is indeed flat.

The Idea of Inflation Makes One Clear Prediction That, Until