


The poetic pleasure indulged thus far is complemented by the fact that the moon has no atmosphere, but only a thin exosphere – a cubic centimeter of Earth’s atmosphere at sea level contains about 100 billion billion molecules whereas that same volume of the Moon’s exosphere contains only about 100 molecules[3] . Not only that, during the lunar night, this exosphere falls to the ground, sleeping perhaps. Because of this lack of atmosphere, footsteps left on the moon will last millions of years. Forever can’t be measured but relative permanence is possible, as long as the heliosphere endures to save us from the unrelenting intergalactic radiation.
Thank you for helping me choose, dear muse.
Acknowledgement
[1] http://burro.astr.cwru.edu/stu/earth_moon.html
[2] http://www.sciencedaily.com/releases/2011/08/110818093046.htm
[3] http://science.nasa.gov/science-news/science-at-nasa/2009/23oct_ladee/
[2] http://www.sciencedaily.com/releases/2011/08/110818093046.htm
[3] http://science.nasa.gov/science-news/science-at-nasa/2009/23oct_ladee/
[4] The moon formation photo is from http://news.nationalgeographic.com/news/bigphotos/49530832.html
[5] The tide diagram is from http://www.sciencebuddies.org/science-fair-projects/project_ideas/Astro_p009.shtml
[6] The heliosphere photo is from http://www.nasa.gov/images/content/274844main_DaveHeliosphereFlippedVis4Lg.jpg
[7] The full moon photo is from http://www.dipity.com/tickr/Flickr_moons/
[8] With apologies to the poet A.E. Stalling for the fragmented quote of her poem.