Download Geocentric System

Geocentric System
The model in which Earth is at
the center of the system of
planets
Heliocentric System
The model in which the sun is
at the center o the system of
planets.
Gravity and Inertia
The two factors that combine
to keep the planets in orbit
Inertia
The tendency of a moving
object to continue moving in a
straight line or a stationary
object to remain in place
Gravity
The force that pulls objects
toward each other
Retrograde Rotation
The spinning motion of a
planet from east to west,
opposite to the direction of
rotation of most planets and
moons
Solar System
A large planetary system that
consists of a combination of
many smaller planetary
systems and objects
Solar Flare
An explosion of hydrogen gas
from the sun’s surface that
occurs when loops in sunspot
regions suddenly connect
Solar Wind
A stream of electrically
charged particles produced by
the sun’s corona
Terrestrial Planets
The first four inner planets:
Mercury, Venus, Earth and
Mars that are characterized as
being small and having rocky
surfaces
Gas Giants
The first four outer planets:
Jupiter, Saturn, Uranus and
Neptune that are
characterized as being large
and having a gas surface
Comet
A ball of ice and dust whose
orbit is a long, narrow ellipse
Asteroid Belt
A region of the solar system
between the planets Mars and
Jupiter where many asteroids
are found
Meteor
A streak of light in the sky
produced by the burning of a
meteoroid in Earth’s
atmosphere