Science. 1989 Jan 13;243(4888):198-200. doi: 10.1126/science.243.4888.198.
The images of the nucleus of comet Halley returned by the Giotto spacecraft reveal a number of active regions on the surface, one of which is near the expected location of the rotation pole. This feature is larger and brighter than other source regions, suggesting that the mechanism that drives this source is also different. At this active region near the rotation pole, the sun was circumpolar for a significant portion of the solar encounter. Continuous insolation heated the nucleus to greater depths than in other areas, producing the broad, active polar region.
由“Giotto”号太空船传回的哈雷彗星核的图像显示出表面上有许多活跃区域，其中一个就在预计的旋转极附近。这个特征比其他源区更大更亮，表明驱动这个源的机制也不同。在这个靠近旋转极的活跃区域，太阳在太阳遭遇的很大一部分时间里处于极周。连续的太阳照射使核加热到比其他区域更深的程度，产生了宽阔的活跃极区。
