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.
When Voyager 1 blasted off from Earth on September 5, 1977, it was designed to last for five years. Today, on its 35th anniversary, the space probe continues to communicate with NASA as it approaches the heliopauseâthe boundary between our solar system and interstellar space. The farthest manmade object from Earth, Voyager 1 may keep exploring space for another 10 or 20 years before its power runs out. Meanwhile, check out these cool facts about the spacecraft and its mission. 1. Voyager 1 has an identical twin. In the early 1970s, the National Aeronautics and Space Administration (NASA) developed a mission called Voyager to make a âgrand tourâ of Jupiter and Saturnâand possibly Uranus and Neptune if all went well.