AST 102 Lecture Notes - Lecture 17: Atmosphere Of The Moon, Radionuclide, Signify
Document Summary
Those of you who are too young to remember this simple can"t understand how big a deal it was. If you ask nearly anyone in their late 40s or older, they will be able to tell you about watching that grainy tv signal of neil armstrong stepping down onto the moon. Both the moon and mercury are small, airless worlds that basically finished their planetary evolution 3-4. Gyr ago, and have since altered only via slow cratering. That the moon has no atmosphere has been known for centuries. This is because the moon has a sharp. That is, one sees no blurring from any lunar atmosphere when one looks at the rim of the. Note that the earth does not have a sharp terminator. The most significant distinguishing feature of the lunar terrain is the separation into the lowlands (or maria) and the highlands.
