Awesome / Master of Orion

• Having a ship in your fleet with a Stellar Converter gives you the option to destroy an enemy planet along with the invade and bomb options. Doing so will treat you to a cutscene showing the planet being blown away by a huge laser punching a hole through the fricking thing!
• Defeating the Guardian at the Orion System. Not only do you get a Gaian-Class planet, you also get a few pieces of exceptionally rare ship technology, and get a suped-up precursor ship captained by Loknar The Last Orion.