I always thought those were Vader’s ashes, since Kylo is a majot Vader fanboy. Like that one scene in Robocop 2 that had an Elvis collection of items like Elvis’ jumpsuit, Elvis’ guitar. And Elvis!

There’s also an “Easter Egg” of astronaut humor that I spotted when I had the chance to go into the Apollo 13 CM just after it arrived at the Kansas Cosmosphere in 1996. You probably can’t see it now since the couches obscure the view, but on the lower left hand side there’s a panel door with an “Emergency Jettison…