Reference:
http://www.sciencedaily.com/releases/2012/02/120203092006.htm
Summary:
Mars may have been arid for more than 600 million years, making it too hostile for any life to survive on the planet's surface, according to researchers who have been carrying out the painstaking task of analysing individual particles of Martian soil.
Critique:
How did we not know this before? Is there any more information that we don't know about this planet or any other planets?
Impact:
there would be no big impact, no one could live on mars as we all already knew.
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