地球以外的宇宙物质坠落地面后,呈砾石形式的称为陨石,呈砂粒级球状矿物形式的称为陨砂,以粉末尘埃形式出现的称为陨尘。前者由于粗大容易被人们发现,所以很早就被人们所重视,尤其是我国对陨石的研究记载比国外早300余年。而后者因为高度的分散及科学技术水平所限,仅个别国家在探索,但很多国家对陨砂的研究确积累了 After the cosmic matter outside the Earth crashed into the ground, it was in the form of gravel called meteorite, and was in the form of grit-shaped spherical minerals called meteorite, which appeared as dust dust in the form of dust. As the former is easy to be found by people, it has long been valued by people, especially the research of meteorite recorded more than 300 years earlier than abroad. However, due to the high degree of dispersion and the limitation of science and technology, the latter is only explored by some countries, but many countries do accumulate research on the meteorite