GEOLOGY

Detailed explanation-1: -An astronaut is someone who travels in space. While the term was once reserved for military-trained professionals, recent accessibility of space travel has seen the term astronaut now used to refer to anyone traveling in a spacecraft, including civilians.

Detailed explanation-2: -astronaut, designation, derived from the Greek words for “star” and “sailor, ” commonly applied to an individual who has flown in outer space. More specifically, in the West, astronaut refers to those from the United States, Canada, Europe, and Japan who travel into space.

Detailed explanation-3: -A professional space traveler is called an astronaut.

Detailed explanation-4: -There are three types of astronauts in the U.S. space program: the commander/pilot, mission specialist, and payload specialist.