标签： 大峡谷

2020 May 24 Valles Marineris: The Grand Canyon of Mars Image Credit: NASA, USGS, Viking Project Explanation: The largest canyon in the Solar System cuts a wide swath across the face of Mars. Named Valles Marineris, the grand valley extends over 3,000 kilometers long, spans as much as 600 kilometers across, and delves as much as 8 kilometers deep. By comparis...

2020 February 4 A Sunset Night Sky over the Grand Canyon Image Credit & Copyright: Robert Q. Fugate Explanation: Seeing mountain peaks glow red from inside the Grand Canyon was one of the most incredible sunset experiences of this amateur photographer’s life. They appeared even more incredible later, when digitally combined with an exposure of the ...