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Find the approximate mass of the luminous matter in the Milky Way galaxy, given it has approximately $10^{11}$ stars of average mass 1.5 times that of our Sun.

$3 \times 10^{41} \mathrm{kg}$

Physics 103

Chapter 34

Frontiers of Physics

Wave Optics

Particle Physics

Simon Fraser University

Hope College

McMaster University

Lectures

02:51

In physics, wave optics is…

10:02

Interference is a phenomen…

01:56

Find the approximate mass …

01:50

What is the mass of our ga…

01:10

Assume that there are 1 tr…

01:43

Estimate the size of a neu…

02:48

Assuming a circular orbit …

01:59

07:55

EST Density of our galaxy …

04:28

The Sun, which is $2.2 \ti…

02:53

The Milky Way has about 50…

03:23

Astronomical observations …

05:06

02:56

Astronomy The black hole i…

03:00

04:57

(II) A neutron star whose …

03:55

The Sun rotates about the …

01:58

Quasars are thought to be …

01:07

A neutron star is a stella…

01:40

A star is estimated to hav…

03:39

06:07

Our galaxy (the Milky Way)…

So the problem is too. Find approximate mass off our galaxy and we are given that the luminous matter salami call this luminous matter is this 10 to 11 times the mass of the sun. So what I mean is that there are roughly tend to the 11 stars whose average mass is 1.5 times the mass of the sun. So this is the luminous Mado. And then you're also stated in the problem that we have dark matter whose mass is 10 times the luminous matter, right? Good. So the total mass becomes the dark matter which I called him D m and the luminess matter. Now I plug in How much dark might I have, which is 10 times the luminous matter, plus the regular luminous matter. So the total mass is 11 times the luminous matter. So now I just plug in this relation and I obtain that 11 times 10 to the 11 times 1.5 times the mass of the sun. And we can refer to the text book for the mass of the Sun and tells us the mass of the sun Is this 1.99 into tented 30 kilograms. Just do a simple calculation, and this tells you that the mask off our galaxy is three times 10 to the 42 kilograms. That's a huge number.

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