Hydranencephaly or hydrancephaly [1] is a condition in which the brain's cerebral hemispheres are absent to varying degrees and the remaining cranial cavity is filled with cerebrospinal fluid.[2]
JPL built and operates the twin Voyager spacecraft. The Voyagers Interstellar Mission is a part of NASA's Heliophysics System Observatory, sponsored by the Heliophysics Division of NASA's Science Mission Directorate in Washington.
Launch & Exploration: NASA's Voyager 1 spacecraft was launched in September 1977 and flew by Jupiter and Saturn before continuing on toward interstellar space. NASA's Voyager 2 spacecraft also flew by Jupiter and Saturn and went on to explore Uranus and Neptune.