Interplanetary matter
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A general term for tiny solid particles, gases, charged particles, etc. that exist in the space between planets in the solar system. Particularly tiny solid particles are called interplanetary dust. Most are 0.1 mm or less in diameter. They scatter sunlight, producing zodiacal light and countersunlight. Interplanetary dust orbits the Sun, but because it is so tiny, it is affected by the Sun's light pressure and gradually approaches the Sun (to a distance of about four times the radius of the Sun). Source : Heibonsha Encyclopedia About MyPedia Information |
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太陽系の惑星の間の空間に存在する微小固体粒子やガス，荷電粒子などの総称。特に微小な固体粒子は惑星間塵という。大多数は粒径0.1mm以下。太陽光を散乱して黄道光や対日照(たいじつしょう)を生じる。惑星間塵は太陽のまわりを公転しているが，微小なため太陽の光圧の影響を受け，しだいに太陽に近づいていく（太陽半径の約４倍の距離まで）。
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