Mercury's newly discovered 'great valley' makes the Grand Canyon look small - Digital Trends

Digital Trends
Mercury's newly discovered 'great valley' makes the Grand Canyon look small
Digital Trends
Astronomers just discovered a valley on Mercury that dwarfs the Grand Canyon. At about 250 miles wide and 600 miles long, Mercury's “great valley” would stretch between New York City, Washington D.C. and Detroit and cut into the Earth twice as deep as ...
Mercury's Newly-Discovered "Great Valley" Puts Earth's Grand Canyon to ShameSmithsonianall 10 news articles »