* Astronomy

Mammoth Cave National Park is a U.S. National Park in central Kentucky, encompassing portions of Mammoth Cave, the longest cave system known in the world. The official name of the system is the Mammoth-Flint Ridge Cave System for the ridge under which the cave has formed.
On September 9, 1972, a six-person CRF team of Wilcox, Crowther, Zopf, Gary Eller, Stephen Wells, and Cleveland Pinnix (a National Park Service ranger) followed Hanson's Lost River downstream to discover its connection with Echo River in Cascade Hall of Mammoth Cave. With this linking of the Flint Ridge and Mammoth Cave systems, the "Everest of speleology" had been climbed. The integrated cave system contained 232.4 km of surveyed passages and had fourteen entrances.
Read more