「天空の降灰現象」の想像図 (IMAGE) National Institutes of Natural Sciences Caption 原始惑星系円盤の中心から吹き上がるガス流で塵の粒子が巻き上げられ、それが円盤の外縁部に降り積もるようす。 Credit 鹿児島大学 Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.