The seventh wonder of our solar system is Enceladus and was discovered by German Astronomer William Herschel in 1789 (Soylent Communications). The NASA’s website description of Enceladus is as followed.
“Enceladus [en-SELL-ah-dus] is one of the innermost moons of Saturn that reflects almost 100 percent of the sunlight that strikes it.” (National Aeronautics and Space Administration)