# MMS Spin Test

The four MMS observatories each undergo what's called a spin test, to learn how well the spacecraft is balanced. Italso provides information on how well the mass properties of an observatory can be measured and aligned. This movie shows Observatory #4 undergoing the test in May 2013 on the MRC Mark V spin balance machine. After launch, the MMS observatories will spin at approximately 3 revolutions per minute during normal operations.

- Kind: Film
- Year: 2014
- By: NASA Goddard Space Flight Center
- Genres: Science, Space
- Archive: [NASA Image and Video Library](https://images.nasa.gov/details/GSFC_20140604_MMS_m11561_Spintest)
- Licence or status: [NASA media guidelines](https://www.nasa.gov/nasa-brand-center/images-and-media/) (as the archive states it)
- Credit: NASA Goddard Space Flight Center
- Who can watch: Tweens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/nasa/GSFC_20140604_MMS_m11561_Spintest?play=1)