Author Question: If the absolute magnitude, M, of a supernova is 19 and a galaxy is found that contains a supernova ... (Read 97 times)

daltonest1984 · **on:** Jul 27, 2018

If the absolute magnitude, M, of a supernova is 19 and a galaxy is found that contains a supernova with an apparent magnitude, m, of 16 . What is the distance to the galaxy? Hint: dpc = 10(m - M + 5)/5

a. 100 AU
b. 100 pc
c. 100 ly
d. 100 kpc
e. 100 Mpc

Question 2

What is the difference between the proton-proton chain and the CNO cycle?

What will be an ideal response?

mcinincha279 · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

e

Answer to Question 2

The proton-proton chain occurs at temperatures over 4 million Kelvin, and combines hydrogen to make helium.

The CNO cycle, which occurs at temperatures greater than 16 million Kelvin, results in the same product as the proton-proton chain. It is different than the proton-proton chain because carbon-12 begins the cycle and ends the cycle, and includes steps in which protons combine with carbon and nitrogen nuclei.