NASA
National Aeronautics and Space Administration (NASA)/ ˈ N æ s ə/）， Also known as NASA or NASA, it is an administrative research agency of the US federal government responsible for...
MOON
The moon is the fifth largest satellite in the solar system, with an average radius of approximately 1737.10 kilometers, which is 0.273 times the radius of the Earth; The quality...
aurora
北极光是一种色彩缤纷的发光现象，出现在地球北极的高磁纬度地区。它是由来自地球磁层或太阳的高能带电粒子流（太阳风）激发（或电离）高层大气中的分子或原子引起的。生产。阿拉斯加、靠近北极的加拿大北部以及中国黑龙江省大兴安岭地区的漠河市是观赏北极光的最佳地点。...