It's hard to imagine that there should be snow mountains in Hawaii. Mauna Kea means "white mountain" in the local language of Hawaii. It's also a sacred place in the hearts of Hawaiians. Mauna Kea's summit is recognized as the best observatory site in the world, so it is home to the world's top astronomers and observatories. The special location of the top of the mountain, 300 clear nights a year, can almost see the low latitude of the sky near the northern latitude of 20 degrees in the northern and southern hemispheres, and the low density of the population makes man-made pollution sources very slight. All these factors contribute to Mauna Kea's beautiful sky.