« previous entry | next entry »
Aug. 23rd, 2007 | 12:44 am
posted by: beachofdreams in exobio
"I fear that Mike Martinez's idea of diverting comets to Mars in order to speed up the process of terraforming is a complete non-starter as a means of colonisation (15 October, p 23). A great deal more than water will be needed to achieve even the first stage of terraforming, which is ecopoeisis - the creation of a self-sustaining biosphere.
At least four main modifications to Mars will have to be performed if basic anaerobic plant life is to survive. The mean surface temperature must be such that water can exist in liquid form; the mass of the atmosphere must be increased; surface ultraviolet light and cosmic rays must be reduced to a safe level for life; and nitrogen, which is essential to all organisms, must be present."