i apologize if this question is very basic. What is a reaction/ momentum wheel? i've been doing some research for a cubeSAT project, and these have popped up often in terms of attitude control. I really don't understand what a flywheel is, but if i knew that then maybe a reaction wheel would not seem so daunting. i know it's a wheel :) and it's motion affects that of the object you are trying to move....? i really don't understand how it works.