The science, technology, and practice of human and robotic space travel, including spacecraft design, launch systems, and orbital mechanics.
From 'astronautic' plus '-ics' to form a noun meaning the field or discipline. The term became standard in the 1950s-60s as space programs professionalized.
Astronautics is humanity's newest science—less than 70 years old—yet it's already taken us to the Moon, Mars, and beyond, making it one of the fastest-advancing fields in all of science!
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