Astronomy buffs in the western U.S. were treated to an eclipse known as the Ring of Fire over the weekend. Technically, it's an annular solar eclipse, during which time the moon passes between the earth and sun. The moon blocks out much of the sun's light and casts a giant shadow on the earth.
Researchers at Crater Lake National Park in southern Oregon have spent the past two years documenting the park's natural sound. Often, microphones will pick up the sound of falling trees, elks snacking and coyotes howling.
In even the most remote parts of the park, however, researchers are also hearing airplane noise 15 percent of the time.