Prasad M Shyam, Rudraswami N G, de Araujo Agnelo Alexandre, Khedekar V D
Geological Oceanography Division CSIR-National Institute of Oceanography Dona Paula, Goa, 403004, India.
Sci Rep. 2018 Jun 11;8(1):8887. doi: 10.1038/s41598-018-27158-x.
Dust dominates extraterrestrial flux on the earth (30,000 tonnes/yr), however only ~5% of the cosmic dust survives atmospheric entry which is basically in two forms: melted and unmelted. Melted micrometeorites undergo transformational changes due to heating during atmospheric entry which obliterate evidences regarding their precursors. Unmelted micrometeorites (UMM) survive atmospheric entry with minimal alteration, they provide direct evidence for their parent bodies. Recent investigations unravelled a wide range of UMM, there are however no quantitative estimates of sources that contribute to the cosmic dust accreted by the Earth.
尘埃在地球的外星物质通量中占主导地位（每年30000吨），然而，只有约5%的宇宙尘埃在进入大气层后幸存下来，基本上有两种形式：熔融态和未熔融态。熔融的微陨石在进入大气层时由于加热而发生转变，这消除了有关其前身的证据。未熔融的微陨石（UMM）在进入大气层后幸存下来，变化极小，它们为其母体提供了直接证据。最近的研究揭示了各种各样的未熔融微陨石，然而，对于导致地球积累宇宙尘埃的来源，尚无定量估计。
