Hi, I have a short question...

Is it right that Space Docks are destroyed when the planet they are bound to gets invaded and claimed by the ground troops of an enemy race?

Thanks for any help!!

From rules, page 18:

Invasion Success?
If all defending Ground Forces were destroyed and at
least one attacking Ground Force survived the battle,
the invasion is a success. All defending PDS units and
any Space Dock on the planet are immediately
destroyed. The attacking player then claims the Planet
Card from the previous owner and places it, exhausted,
into his play area.

Note that there are is an exception: There are two ways to "capture" a Space Dock. If the invader's landing force contains an agent, or if it contains a Shock Troop (at the end of Combat), the attacker can choose to capture the Dock by removing it and placing one of his own there. (Assuming, of course, the attacker doesn't already have all 3 docks on the board).

Thank you both very much!!! :-)

Also, remember that turning a planet into neutral state (via action cardspolitical cards) will also dstroy any Space docks PDS present.