Planet Movement
• When moving onto a planet hex the unit may only move 1 hex and must stop.
Planet Combat
• The turn after a unit occupies a planet grouping, the unit will combat as normal.
Please note to make planet move and combat a little more clear, I updated the second bullet under Planet Combat p.30 from "planet hex" to "planet grouping".
Basically how units on planets are played, once the unit is on the planet grouping it can only move 1 hex when onto another planet hex in the grouping but the unit because it was already on a hex in the planet grouping the unit still can battle. It is just when first moving onto a planet grouping that a unit cannot battle, except for long range fighter units.
https://boardgamegeek.com/thread/2185962/article/31759932#31759932
Destroyer & Planet hex
A Destroyer unit after a successful close quarters combat against an enemy unit on a planet hex may pursuit move onto a planet hex, but the Destroyer unit may not combat.
Battle Fury & Planet hex
Any unit after a successful close quarters combat against an enemy unit on a planet hex that has a Battle Fury combat card played on the unit, may pursuit move onto a planet hex and bonus combat.
https://boardgamegeek.com/thread/2418806/red-alert-carriers-and-more