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Author Question: If a galaxy has a radial velocity of 8000 km/s and the Hubble constant is 70 km/s/Mpc, what is the ... (Read 170 times)

DelorasTo

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on: Jul 27, 2018
If a galaxy has a radial velocity of 8000 km/s and the Hubble constant is 70 km/s/Mpc, what is the distance to this galaxy?
 
  a. 8.75  103 Mpc
  b. 2.4  109 Mpc
  c. 5.6  105 Mpc
  d. 114 Mpc
  e. 8.75  10-3 Mpc

Question 2

Why do nuclear reactions in a star occur only near its center?
 
  What will be an ideal response?


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ilianabrrr

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

d

Answer to Question 2

High-speed collisions between atoms and subatomic particles are necessary to overcome the Coulomb barrier, and this means high temperature. The gas density must also be high so the number of collisions per second is large. Only near a star's center are these conditions right for nuclear reactions to occur.


DelorasTo

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Reply 2 on: Jul 27, 2018
Gracias!

xiazhe

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Reply 3 on: Yesterday
Wow, this really help

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