... CG4: A Ruptured Cometary Globule . ... Can a gas cloud grab a galaxy? ... Valles Marineris: The Grand Canyon of Mars . ... The largest canyon in the Solar System cuts a wide swath across the face of Mars. ... 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. ... The early morning hours of May 6 were moonless when grains of cosmic dust streaked through dark skies. ...