Exam 26: Cosmology

Suppose we were to discover that the distances to other galaxies had all been overestimated by a factor of two.How would this discovery affect our estimate of the age of the universe?

In which part of the sky is the cosmic background radiation brightest?

Which of the following is a statement of the cosmological principle?

Which of the following observations motivated the suggestion that the early universe experienced a brief period of extremely rapid inflation?

An observer now located at a distance of 3 billion light years from us could look in our general direction and see

The universe is generally assumed to be isotropic.What does "isotropic" mean?

The expansion age of the universe is about

What important event happened about 300,000 years after the universe began to expand?

The underlying cause of inflation is believed to be

In which part of the spectrum is the cosmic background radiation brightest?

Imagine that a year from now you read that astronomers have discovered a group of 50 billion-year-old stars.What would you conclude from such a discovery?

Which of the following statements about the first few minutes of the Big Bang is true?

Why is the cosmic background radiation found primarily in the radio part of the spectrum?

Which of the following is true for a universe in which space is flat?

Which of the following is NOT an implication of Hubble's law?

What has been learned from extremely distant (high-z)supernovae?

If the universe is flat,where is its center?

If the universe is open (negatively curved),the present expansion will

Why can't we see radiation produced during the first 300,000 years of the history of the universe?

Which of the following combinations will lead to an eventual contraction of the universe?