TAMPA, Fla. -- In celebration of its 20-year anniversary and Earth Day's 50-year anniversary, NASA's Earth Observatory is asking for votes to pick its all-time best image.
The observatory has published 16,000+ images since 1999. So, there are a lot to chose from!
To narrow that down, NASA is using a five-round knockout-style tournament. The brackets are past winners, home plant, land & ice and sea & sky.
Click here to vote and view the current standings.