Stephen P.Maran

Astronomy
is the study of the sky, the science of cosmic objects and celestial happenings, and the investigation of the nature of the universe you live in.

constellations
(groups of stars, such as Ursa Major, the Great Bear, named by ancient stargazers) that amateur or hobbyist astronomers first explore.

planet
comes from the ancient Greek word
planetes,
meaning “wanderer.”