Extraterrestrial Dust

Preface. <strong>I.</strong> Recognition of Interplanetary Dust Clouds by Astronomical Observations. <strong>II.</strong> Motion and Distribution of Interplanetary Dust. <strong>III.</strong> Meteor and Noctilucent Clouds. <strong>IV.</strong> Sampling and Analyses of Stratospheric Dust. <strong>V.</strong> Extraterrestrial Matter Accretion into Deep Sea Sediments. <strong>VI.</strong> Studies on Spherules Collected from Ice Layers and Deep Sea Sediments. <strong>VII.</strong> Simulation Test Experiments. <strong>VIII.</strong> Direct Measurements of Interplanetary Dust in Space. <strong>IX.</strong> Microcrater Formation by Dust Impacts. <strong>X.</strong> Recovered Particles from Crater Regions of Meteorite Falls. <strong>XI.</strong> Grain Formation and Pre-Cursor Grains. <strong>XII.</strong> Discussions and Interim Conclusion.