   Chapter 34, Problem 2PE

Chapter
Section
Textbook Problem

Find the approximate mass of the dark and luminous matter in the Milky Way galaxy. Assume the luminous matter is due to approximately 1011 stars of average mass 1.5 times that of our Sun. and take the dark matter to be 10 times as massive as the luminous matter.

To determine

The approximate mass of the dark and luminous matter in the Milky Way galaxy.

Explanation

Given data:

Mass of the sun is ms=1.99×1030kg.

Number of star is n=1011.

Formula used:

The formula for approximate mass of the luminous matter in the Milky Way galaxy is,

M=n×1.5ms   ......... (1)

The approximate mass of the dark and luminous matter in the Mily Way galaxy is,

M=10ML   .........(2)

Calculation:

Substitute the given value in equation (1).

M=1011×1.5×1.99×1030kg=2

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