Our 'Pale Blue Dot'

TECH SPACE HUMAN EARTH HISTORY ANIMALS ADVENTURE VIDEO View Online Our 'Pale Blue Dot' Nearly 25 years ago, Voyager 1 snapped a photograph that yielded an iconic image of Earth. READ MORE Must-See Planet Pics: Earth Day 2015 Edition This Earth Day, take a tour of the world's largest desert, a massive iceberg on the move and a deep ocean dive. READ MORE WATCH VIDEO: Why Trees Can't Grow on Mountaintops Ever look at the tree line on a mountain? It's all trees, trees, trees, and then -- Zfft! Earth Day, Plan B: Five Bold Geoengineering Plans From artificial forests to space umbrellas, researchers are exploring worst-case-scenario fixes to climate change. READ MORE WATCH VIDEO: 5 Islands That Are Going To Disappear These islands are at risk of going bye-bye in the next 30 years, as sea levels rise. What Happens When a Meteor Strikes Earth? Most of the near earth objects that approach Earth burn up in our atmosphere. What happens to the ones that don't? WATCH Follow Discovery News on Facebook! Get your sci-tech headlines all day on Twitter too! At Discovery Communications, we value your privacy. If you would like to be removed from future communications like this, please click here. Privacy Policy Discovery Communications, LLC One Discovery Place Silver Spring, MD 20910 © Copyright 2015 Discovery Communications, LLC