Based on the best estimates of the Hubble constant and the density of the universe, what is the approximate age of the universe? How uncertain is this number? Why is it uncertain?
What is the Cosmological Constant? Why was it originally invented by Einstein?
What is Cosmological Redshift? How does it differ from normal the redshift caused by motion?
How was the Cosmic Background Radiation first discovered?
What produces the Cosmic Background Radiation?
Why do measurements of the Cosmic Background Radiation provide important data about the early universe?
What is COBE? What were the measurements it made of the Cosmic Background Radiation?
How can we determine the rate the universe is decelerating? Why is this an important factor in determining the eventual fate of the universe?