An international team of researchers led by Durham University believe they’ve discovered the largest canyon on Earth. Using satellite data and ground-penetrating radar, they estimate it to be more than 100 km long and as deep as 1 km in places. They’ll need to make direct measurements to confirm these findings, though that will be difficult given that the canyon is buried under several kilometers of East Antarctic ice sheet. The team suspects that the canyon was either carved out of the bedrock by water flowing under the ice or is so absurdly old that it was around before Antarctica shifted to the South Pole via tectonic forces and frozen over.

Read more at http://www.engadget.com/2016/01/15/scientists-may-have-found-earths-largest-canyon/