"32 will vie for the title, but only one can be the winner."
That's what NASA is saying about it's own March Madness bracket.
NASA selected the best Earth images from 2012 and is now asking the public to fill out a bracket and vote for the best image.
Voting starts today and continues through April 5th. Each week the field will be narrowed from 32 to 16 to 8 to 4 to 2. The winner will be announced after voting is closed in April.
The four bracket themes are Earth at Night, Events, Data, and True-Color.
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