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Author Question: The dark halo is now believed to extend at least A) 100,000 light-years. B) 50 kpc. C) 8 kpc. ... (Read 33 times)

Hungry!

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on: Jul 27, 2018
The dark halo is now believed to extend at least
 
  A) 100,000 light-years.
  B) 50 kpc.
  C) 8 kpc.
  D) 15,000 light-years.
  E) 15 kpc.

Question 2

How can Betelgeuse be only half the Sun's surface temperature, yet about 10,000 times more luminous than the hotter Sun?
 
  What will be an ideal response?


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lolol

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

B

Answer to Question 2

It may be cooler, but it is about 1,000 times the Sun's diameter, and has a surface area almost a million times greater than the Sun.


Hungry!

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Reply 2 on: Jul 27, 2018
Gracias!

nguyenhoanhat

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Reply 3 on: Yesterday
Wow, this really help

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