Asteroid
A planetary body is a non-luminous object rounded by it's own gravity that orbits a star or a stellar remnant. A moon, or satellite, orbits a planetary body.
the moon.
They are in the shape of an ellipse.
Yes. Planets (and other things) orbit at a higher speed the closer they are to the object they are orbiting.
Kepler
a planetary satellite is any object that orbits a planet
A planetary body is a non-luminous object rounded by it's own gravity that orbits a star or a stellar remnant. A moon, or satellite, orbits a planetary body.
"Planetary orbits" is the technical term.
Planetary orbits that are elliptical will have a greater focus.
Yes
A satellite is any mass that orbits a larger mass. A satellite may be a planet, moon, asteroid, or comet. The word 'satellite' is also used to refer to any man-made object launched to orbit Earth or another planetary body. Artificial satellites may be spacecraft or orbiting telescopes.
He suggested the orbits were circles.
the moon.
They are in the shape of an ellipse.
Kepler
Yes. Planets (and other things) orbit at a higher speed the closer they are to the object they are orbiting.
Asteroid Comets are icy conglomerations of material, so cannot be called a "rocky object".