Subject: What force keeps electrons spinning?

In other words, why don't electrons slow down? Also, why don't the 
electrons get sucked into the nucleus (Surely it's not the centrifugal 
force that keeps them separated)? And the same thing applies to the 
planets. What keeps the planets spinning at approximately the same speed 
and holds them out from the sun? Is the same force involved? Does the 
nucleus have a gravity like the sun?
These might be simple questions but I can't find or figure out the answers.
Thanks in advance.

Re: What force keeps electrons spinning?