# Galaxy Wavelength (Milky Way)

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1. Jul 21, 2010

### cloud_sync

I am creating this wavelength chart (attached).

I was told to use Compton's formula; I got this:
(6.626068 × (10^(-34))) / (1.1542e+42 * 299 792 458) = 1.91493535 × 10-84

Apparently, it is substantially off scale. I was then told to try de Broglie wave. Wikipedia only shows relations. I am learning the ropes here; I would like to see the process in how to derive a galaxy's (i.e. Milky Way) wavelength.

#### Attached Files:

• ###### 001_wav.jpg
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2. Jul 21, 2010

### Staff: Mentor

Welcome to the PF.

What do you mean by "wavelength"? Do you just mean size? Or are you asking about resonant frequencies or emitted radiation wavelength ranges?

3. Jul 21, 2010

### Chronos

The Milky Way does not have a 'wavelength'. It's radiation is spread across most of the EM spectrum. I believe you are thinking of the big bang - which does have a wavelength, so to speak - specifically accoustical wavelengths. This is a horse of a different color.

4. Aug 5, 2010

### cloud_sync

A galaxy = planets + gas + space debris = matter. Wikipedia had the Milky Way's mass so how would one derive the wavelength of a galaxy (attachment above) from a side view. Has this ever been calculated in science?

5. Aug 5, 2010

6. Aug 5, 2010

### cloud_sync

Electromagnetic. What wavelengths are you guys regarding?

http://en.wikipedia.org/wiki/Electromagnetic_spectrum" [Broken]

Last edited by a moderator: May 4, 2017
7. Aug 5, 2010

### Staff: Mentor

The chart in your original post (OP) appears to show the relative sizes (in meters) of objects, and has little to do with a "wavelength". You can look up the diameter of the Milky Way Galaxy, and fill that into the chart.

Last edited by a moderator: May 4, 2017
8. Aug 5, 2010

### cloud_sync

http://en.wikipedia.org/wiki/Milky_Way" [Broken]

This is disturbingly intriguing. Wiki states the diameter and the thickness, but that cannot be it, could it? Is not a electromagnetic, wavelength measurement from "crest to crest?"

Last edited by a moderator: May 4, 2017