Moonwalk with Your Eyes by Tammy Plotner

Author:Tammy Plotner
Language: eng
Format: epub
Publisher: Springer US, Boston, MA

Fig. 13.4Billy - Damian Peach.

For larger telescopes, let us try a challenging study worthy of your observing skills (Fig. 13.5). Due west of Hansteen you will find a small crater known as Sirsalis near the terminator. It will appear as a small, dark ellipse with a bright west wall along with its twin, Sirsalis B. The feature you will be looking for is the Sirsalis Rille - the longest lunar “wrinkle” presently known. Stretching northeast of Sirsalis and extending 459 km south to the bright rays of Byrgius, this major “crack” in the lunar surface shows several branchings - like a long dry river bed. Geologically forming in the Imbrian period, chances are the Sirsalis Rille is a lunar graben. Thanks to Lunar Orbiter images, the evidence points to shifting tectonic plates as the source of this incredible feature.

Fig. 13.5Sirsalis - Damian Peach.

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