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NASA wants your help picking the all-time best photo of Planet Earth

WASHINGTON (SBG) – NASA is commemorating the 50th anniversary of Earth Day with an interactive tournament where you're calling the shots.

The American space agency needs help picking the all-time best photo of Planet Earth. In the knock-out style tournament, you'll be looking at five different brackets of extraordinary images: Past Winners, Home Planet, Land & Ice and Sea & Sky.

This round ends on April 6 at 9 a.m. EST. Click here to place your vote.

Along with the photo tournament, NASA is offering student activities, DIY projects, virtual tours of the solar system -- and you can even listen to books read by award-winning astronaut Christina Koch on Instagram!