The ... has produced many... spectacular images... But when you're floating... in space... how do you hold… — Helen Czerski
The ... has produced many... spectacular images... But when you're floating... in space... how do you hold your position... How do you know... which way you're facing? Hubble has six s, each... a wheel spinning... Conservation of angular momentum means that those wheels will [tend to] keep spinning... and the spin axis will stay pointed in... the same direction... The gyroscopes give Hubble a reference direction...
Source: Wikiquote · CC BY-SA 4.0
More from this book
The basic principles alone often won't provide specific answers, but they'll provide the context needed to ask the right questions. And if we're used to working things out... we won't feel hopeless when the answer isn't obvious...
This book is about linking the little things we see every day with the big world we live in.
As far as we know, the physical laws we observe... on Earth apply everywhere... You can test them for yourself.

