Every day, billions of microgram-sized-extraterrestrial particles enter and ablate in the upper layers of the Earth's atmosphere, depositing their mass in the Mesosphere and Lower Thermosphere (MLT). This evaporated meteoric mass is the source of global layers of neutral metal atoms, sporadic E layers of metal ions, and meteoric smoke particles (PMSE, NLC, PMC). This talk will focus on results from an effort which aims to address how much, when, where and how the micrometeoric mass is deposited in the MLT. This includes radar observations of meteor head-echoes as well as astronomical, plasma and chemical models of the ablation processes that these particles undergo upon atmospheric entry. Future efforts that we plan to address with these results will be also discussed.