Meteor dust particles with a diameter of 0.1 mm or less that fall to Earth from outer space include those that are too small to cause meteor phenomena, and those that have disintegrated into fine particles after burning up from meteors. In reality, it is difficult to completely distinguish them from the fine particles dispersed as flue gas from factories on Earth. According to high-altitude observations using rockets, the amount of meteor dust that falls to Earth every day is about 1,000 tons. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
宇宙空間から地上に落ちてくる直径 0.1mm以下の宇宙塵微粒子で,あまり小さいため流星現象を起さないもの,流星が燃散って微塵となったものなどが含まれる。実際には,地上の工場などから排煙として散布された微粒子と完全に見分けることはむずかしい。ロケットによる高空観測の結果では,毎日地球に降り注ぐ流星塵物質の量は約 1000tに達する。
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