Download or read book When Biospheres Collide written by Michael Meltzer and published by www.Militarybookshop.CompanyUK. This book was released on 2011-08 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt: NASA SP-2011-4234. This book presents the history of planetary protection by tracing the responses to the concerns on NASA's missions to the Moon, Mars, Venus, Jupiter, Saturn, and many smaller bodies of our solar system. The book relates the extensive efforts put forth by NASA to plan operations and prepare space vehicles that return exemplary science without contaminating the biospheres of other worlds or our own. To protect irreplaceable environments, NASA has committed to conducting space exploration in a manner that is protective of the bodies visited, as well as of our own planet.