Author Question: Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy with a recession velocity of 21,000 ... (Read 148 times)

go.lag · **on:** Jul 27, 2018

Because the Hubble constant has a value of 70 km/s/Mpc, a galaxy with a recession velocity of 21,000 km/s must be _______________ Mpc from Earth. (Express your answer as a whole number of Mpc)

Fill in the blank(s) with correct word

Question 2

The Chandra observatory uses ________________ mirrors in which the X-rays reflect at shallow angles from the polished inside of the mirrors to form images on X-ray detectors.

Fill in the blank(s) with correct word