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8C10.65 - Spiral Galaxy Arm Formation

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​8C10.65 - Spiral Galaxy Arm Formation

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Title8C10.65 - Spiral Galaxy Arm Formation
Objective

​To demonstrate how rotational motion in a plane can cause spiral arms of a galaxy to form.

StatusAvailable
Assembly Instructions

​Fill the bowl with water.  Put the turn table on a momentary contact switch to allow for easy on/off controls.  Shine a UV light onto the bowl of water.  Prepare an eye dropper full of fluorescent tattoo ink.  Set up a camera to see the top of the bowl of spinning water.

Setup Time10
Operation Time7
Preview Time13
Operation Instructions

Put the camera feed onto the screen.  Turn on the UV light source.  Start the bowl of water spinning up.  Once it is at full speed, drop 2-3 droplets of tattoo ink into the center of the bowl of water and watch how the dye spirals out similar in shape to the arms of a spiral galaxy.​

ExportableNo
Demo on DimeNo
PIRA 200No
Export Instructions (if different)
HazardsNone, Light Hazard - Ultra Violet
Analysis/Information
Category8 Astronomy
Subcategory8C - Cosmology
Keywordsspiral arm, galaxy, formation, rotational motion
Construction Information
 
Equipment TitleUse SHIFT+ENTER to open the menu (new window).
  
QuantityUse SHIFT+ENTER to open the menu (new window).
  
turntable - VDC on aluminum base
1
power supply - 27VDC (demolab made)
1
camera - color
1
squeezee clamp
1
momentary contact switch
1
bench clamp
1
bench rod L-shaped small
1
uv light source with on/off switch and battery pack, 395nm
1
rod clamp
1
clamp 3-fingered
1
banana cable
4
fluorescent tattoo ink
1
water - from the tap
1
bowl - glass, 7.5 in
1
eye dropper - glass
1
beaker 50 mL glass
1
turntable top - aluminum, with holes to mount four wooden holders
1