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Extrasolar Life
This SeaWiFS satellite image shows chlorophyll (which indicates ocean
plants) in the Earth's oceans. The Normalized Difference Vegetation
Index (NDVI) measures the amount and health of plants on land, while
chlorophyll a measurements indicate the amount of phytoplankton in the
ocean.
Credit: SeaWiFS Project, NASA/Goddard Space Flight Center, and ORBIMAGE
01/14/09

 



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