If a galaxy has an apparent radial velocity of 2000 km/s and the Hubble constant is 70 km/s/Mpc, how far away is the galaxy in units of Megaparsecs (Mpc)?
Why do we see the cosmic microwave background (CMB) in every direction in the sky?
Describe what is meant by the phrase “habitable zone.” Do you think that Mars should be included as part of the habitable zone? Explain your reasons why or why not.
Why do we see the cosmic microwave background (CMB) in every direction in the sky?
Describe what is meant by the phrase “habitable zone.” Do you think that Mars should be included as part of the habitable zone? Explain your reasons why or why not.