Based off that post a few pages back about the Jindan/Yuanying vs Nebula/Meteor/Planet progression between normal Xiuzhen practice and Stellar Transformationss, it seems fairly clear that the Meteoric Tear is the remnant of Lei Wei's "Planet". Either that, or it's some kind of technological device Lei Wei had, but probably the former.
Edit: Although, that does raise the question of how the Meteoric Tear was delivered to Qin Yu and if Qin Yu was deliberately chosen, why Starlet didn't summon him then.