During the Cold War, the Soviet Union used a flooded volcanic crater on Simushir as a secret ... in the Northern Hemisphere also mentioned the sun turning blue, purple and green as a result ...

The footage was captured at the Meteor Crater Natural Landmark ... A meteoroid is an asteroid or comet fragment that orbits the Sun and has an approximate size between 10 microns and a meter ...

These are noctilucent (night-shining) clouds. “Even though the sun has set in Gale Crater, the clouds are high enough in the atmosphere that the sun still shines on them, making them seem to ...