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I stole from some guy a planet yesterday and the planet had 0 defence and i builded one fleet and i took it. Today i wanted to steal from the same guy a planet but it's says A Huge Amount ... but the planet had 0 defence.... Then i just tryed to steal a random planet with 0 def and it worked . Can u explain pls ( away for 2-3 years) did somethink change ?

There was an update:

Mobile Defences
To counter the 'but my planets can now be taken' issues, and to add some further excitement to planetary battles, 3 mobile defence platforms are added.
These are assigned to ONE planet (although more than one can be assigned to one planet). The cost to build defences is less than an average size planet, although it does go up the more defences are added to the platform.
The concept is that while overall planets may be easier to battle than before, with these, one to three of them will not be, and additionally will hold a 'hidden suprise' for attackers.
These platforms are not spyable - where they are only you know. So when an enemy spies, and sends in fleets, if that is where your mobile platform(s) are, there is a good chance the fleet will be totally wiped out....
Likewise if your planets are getting massed, a quick change of where your mobile platform is, can bring down the fleet....
This is an update partially to secure some key planets, partially to increase the thrill, strategy and devestation of planet battles

Bolded interesting parts

O snap! Thnx for quick replay!!!