The Lightship Nantucket WLV612 is one of a long line of ships that served to warn others of the dangerous Nantucket Shoals. It’s the only operational one left, and Bill and Kristen Golden bought it for $126,000 on eBay in 2000. They restored it and created an elegant interior. The ship can still shine its bright lights and sound the foghorn from its former life, but nowadays it is home for the Goldens. On Wednesday evening, the Lightship Nantucket came alongside the Kennedy compound and turned on its lights to illuminate the late Senator Ted Kennedy’s schooner.