Some astrobiologists think plants on other worlds could havepurple, not green, chlorophyll. FNC/NASA
From FOX News/Space:
Could an alien astronomer have detected life on Earth during an ice age?
Recent work has calculated how past climate extremes affected the light reflected from vegetation out into space. The results could give hope to our own search for life on distant worlds.…

February 17th, 2009
Tushar Mathur
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