I'm writing a story in which certain objects no longer exist. I was going to refer to them as "relics" but a relic is something from a bygone age that survived the passage of time and now exists in our time.

What do you call something that no longer exists. I need a word that conveys the idea that these inanimate objects did once exist but no longer do.

Edit: I didn't want to reveal too much but I guess I need to add context. A character in my story is ancient. He is from a time when stars still existed but the stars have long since faded away and have been forgotten by everyone except him. In passing he mentions how he misses the stars and another character asks him what stars are. He says something along the lines of "Relics of a bygone age".

I'm looking for a word that replaces "relics" and implies that the stars did not survive the passage of time.