| タイトル | Crater populations on Ganymede and Callisto |
| 著者（英） | Woronow, A.; Gurnis, M.; Strom, R. G. |
| 著者所属（英） | Arizona Univ. |
| 発行日 | 1981-09-30 |
| 言語 | eng |
| 内容記述 | Voyager 1 observations reveal heavily cratered surfaces on Ganymede and Callisto which suggest that a period of heavy bombardment occurred in the outer solar system. The overall crater density on Ganymede indicates that the oldest regions began recording the observed crater population at a later time than Callisto. A diameter-dependent loss of craters from 10-40 km occurs on Ganymede and may be due to ice formation or the formation of arcuate troughs. Evidence is given which suggests that the population of bodies responsible for the period of late heavy bombardment in the inner solar system is very different from that responsible for the late heavy bombardment in the outer solar system. In addition, it is postulated that Ganymede and Callisto may principally record a population of bodies that never penetrated the inner solar system in numbers great enough to leave a recognizable signature. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 82A12367 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/413259 |
