yes
True
AAristotle developed the theory that planets are spheres and move in concentric circles around the sun
Eudoxus
density stratification
Ptolemy considered the solar system (and the universe) to be a set of crystal concentric spheres rotating around the stationary Earth at its centre. On the closest sphere was the moon, then Venus and so on out to the stars on the outer sphere. At the time they didn't have any idea how incredibly big everything is.
True
yes
False
"Geocentric".
True
Aristotle believed that the Earth was at the center of the universe, with all other celestial bodies revolving around it in a series of concentric spheres. This geocentric view of the universe contrasted with the later heliocentric model proposed by Copernicus.
ptolemaic system
Ptolemaic system
The word concentrically simply means in a concentric manner. Concentric is a term used to describe spheres of different sizes with a common middle point.
AAristotle developed the theory that planets are spheres and move in concentric circles around the sun
Eudoxus
density stratification