Author Question: The dark halo is now believed to extend at least A) 100,000 light-years. B) 50 kpc. C) 8 kpc. ... (Read 32 times)

Hungry! · **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?

lolol · **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.