... Valles Marineris: The Grand Canyon of Mars . ... The largest canyon in the Solar System cuts a wide swath across the face of Mars. ... Inside the Flame Nebula . ... The Flame Nebula stands out in this optical image of the dusty, crowded star forming regions toward Orion's belt, a mere 1,400 light-years away. X-ray data from the Chandra Observatory and infrared images from the Spitzer Space Telescope can take you inside the glowing gas and obscuring dust clouds though. ...