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Author Question: If a galaxy is located at a distance of 18 Mpc and is found to have recessional velocity of 1170 ... (Read 67 times)

Cooldude101

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on: Jul 27, 2018
If a galaxy is located at a distance of 18 Mpc and is found to have recessional velocity of 1170 km/s, what is Hubble's constant based only on this galaxy?
 
  a. 65 km/s
  b. 75 km/s
  c. 55 km/s
  d. 85 km/s
  e. 95 km/s

Question 2

What is the difference between a planetary nebula and a supernova remnant?
 
  What will be an ideal response?


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komodo7

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Reply #1 on: Jul 27, 2018
Answer to Question 1

a

Answer to Question 2

A planetary nebula is the result of an aging giant star expelling its outer atmosphere in repeated surges to form an object composed of ionized gas. A supernova remnant is the nebular remains of a supernova explosion.


Cooldude101

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Reply 2 on: Jul 27, 2018
Wow, this really help

frankwu0507

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Reply 3 on: Yesterday
Excellent

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