Define !
Whats a system?
a set of collected parts
What is Keeplers big discovery
planets move around the Sun in orbits shaped like ellipses.
Universe
everything and everything in it
who discovered gravity
Sir Isaac Newton
Geocentric theory
The theory that states the planets and stars orbit earth
who discovered the geocentric theory
Ptolemy
heliocentric theory
the theory that states the planets and stars revolve around the sun
who discovered the geocentric theory
Ptolemy
galaxys
contains as, rock, dust and planets
who supported the heliocentric theory
most all people from the past, the reason