Ocean-studying satellite 'no longer recoverable'
Tuesday, March 15, 2011 - 16:31
in Earth & Climate
Astronauts famously call Earth the blue planet, a reflection of its watery surface. But, if you want to understand the other special thing about our planet -- its life -- you need to look at the green. Plants produce the green pigment chlorophyll to harvest the sun's energy and make the food on which nearly all life depends.