You’d get better answers if you shared where you got the idea that we’ve found remnants of Theia. (I doubt most folks who would read this have heard of any such Theia-related developments. For that matter, I was completely unfamiliar with Theia until I googled it just now. But if you shared where you got the idea that we’d found “remnants of Theia”, even folks who hadn’t been familiar with that development could probably read/watch that and maybe provide some insight.)