Milky Way over Yellowstone . ... The colorful pool of water, about 10 meters across, is known as Silex Spring and is located in Yellowstone National Park in Wyoming , USA . ... Steam rises off the spring, heated by a magma chamber deep underneath known as the Yellowstone hotspot . Unrelated and far in the distance, the central band of our Milky Way Galaxy arches high overhead, a band lit by billions of stars. ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...