Barrett's esophagus refers to an abnormal change in the cells of the lower portion of the esophagus. It is characterized by the replacement of the normal stratified squamous epithelium lining of the esophagus by simple columnar epithelium with goblet cells (which are usually found lower in the gastrointestinal tract).
U.S. Space Camp is a camp and related programs owned and operated by the Alabama Space Science Exhibit Commission's U.S. Space & Rocket Center in Huntsville, Alabama.
There are several launch sites available for commercial launches in the United States. The two sites used most frequently are Cape Canaveral Air Force Station in Florida (located on the same piece of land as NASA's Kennedy Space Center, from where the Space Shuttle launched) and Vandenberg Air Force Base in California.oday, commercial space launch vehicles are the only means of transportation to space in the U.S. for privately owned satellites. NASA helps to support the launch industry by flying many of its satellites on launch vehicles that it purchases from private companies.