Research Project code：0350012048
Update date：Jan. 19, 2004
Study of freezing conditions of planets
2001 - 2002
Aiming at elucidation of the orbit element of planet and conditions for existence of living organisms through examination of the conditions of formation of the environment where liquid water can exist, especially the conditions under which a planet gets frozen, experiments were made using a model of atmospheric big circulation. Placing 1 terrestrial atmosphere on each of the ocean planet and land planet with 0 degree, 23.5 degree, 45 degree, and 60 degree in axial inclination, the freezing conditions were determined when the solar irradiation is decreased. In addition to the data obtained last year that the larger the axial inclination the harder is to get frozen and that the land planet is harder to get frozen than the ocean planet, reversely in the recovery from the frozen conditions the ocean planet tends more likely to get recovered. On the other hand, due to that for freezing and unfreezing by axial change, for unfreezing a large solar irradiation is necessary even when the axial inclination is large, it was shown that the rotation axis of a planet in a frozen condition is largely inclined, it alone does not unfreeze the planet.
Ministry with control over the research ：
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Ministry of Education, Culture, Sports, Science and Technology