s*****t
发帖数: 1994 | 1 A Double Ringed Basin on Mercury
Credit: NASA/JHU APL/CIW
Explanation: What created the internal second ring of this double ringed
basin on Mercury? No one is sure. The unusual feature spans 160 kilometers
and was imaged during the robotic MESSENGER spacecraft's swing past our
Solar System's innermost planet last week. Double and multiple ringed basins
, although rare, have also been imaged in years past on Mars, Venus, Earth,
and Earth's Moon. Mercury itself has several doubles, including huge | F***r
发帖数: 1685 | 2 大的先撞进去，然后小的紧跟在后面？
basins
,
Caloris
circular
【在 s*****t 的大作中提到】
: A Double Ringed Basin on Mercury
: Credit: NASA/JHU APL/CIW
: Explanation: What created the internal second ring of this double ringed
: basin on Mercury? No one is sure. The unusual feature spans 160 kilometers
: and was imaged during the robotic MESSENGER spacecraft's swing past our
: Solar System's innermost planet last week. Double and multiple ringed basins
: , although rare, have also been imaged in years past on Mars, Venus, Earth,
: and Earth's Moon. Mercury itself has several doubles, including huge
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