Exogenic and endogenic activities dictate how planetary surfaces evolve. However, the present-day influence of each of these activities is not well constrained. MESSENGER (MErcury Surface, Space ENvironment, GEochemistry, and Ranging) temporal imaging recorded surface changes associated with these activities between 2011 and 2015. Here we present the results of a temporal investigation that identified 20 reflectance changes. One change exhibited bright rays extending from the site, consistent with the aftermath of an impact event. If all changes result from impact events, the present flux rate is 1,000 times higher than models predict. Consequently, we also report changes on slopes in areas with concentrations of tectonic landforms and identify a subset of changes that are on or adjacent to hollows, consistent with present-day endogenic activities. Therefore, we conclude that these observations captured endogenic and exogenic modifications to the surface.

中文翻译：

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目前对汞的内源性和外源性活动

外生和内生活动决定了行星表面的演化方式。然而，这些活动中的每一项在当今的影响都没有受到很好的限制。MESSENGER（水星表面、空间环境、地球化学和测距）时间成像记录了 2011 年至 2015 年间与这些活动相关的表面变化。在这里，我们展示了一项时间调查的结果，该调查确定了 20 次反射率变化。一个变化显示出从现场延伸出来的明亮光线，与撞击事件的后果一致。如果所有变化都是由撞击事件引起的，那么目前的通量率是模型预测的 1,000 倍。因此，我们还报告了构造地貌集中地区斜坡的变化，并确定了空洞上或邻近空洞的变化子集，与当今的内生活动一致。