polar

Volunteer worker Marijn Roorda came dressed as a polar bear to highlight the plight of these animals as their habitat suffers from climate change.

I would marvel at old, remarkably preserved letters and climb below the deck of a famous polar ship.

Inside the planet's polar vortex, temperatures drop dramatically -- much colder than the air outside -- and the continuous darkness of the long Martian winter allows ozone levels in the atmosphere to rise sharply.

He and his colleagues now believe their latest finding -- that certain polar and nonpolar substances* can combine under extreme cold -- could guide future research into the moon's surface and atmosphere.

Robert Peary on polar expeditions and was likely the first human to ever stand on top of the world.