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Earth, Moon,
and Our Solar
System
Vocabulary
Rotation means to spin
around an axis.
Revolution means to
travel in a closed
path.
An axis is an
imaginary line
that runs
through the
center to the
Earth from the
North Pole to
the South
Pole.
A phase is one of the
shapes the moon seems to
have as it orbits Earth.
Orbit is a closed
path of one
object in space
around another
object, or to
move in such a
path.
Seasons are
caused by the
tilt of the Earth.
The Earth is divided into two spheres
called hemispheres. These are the
Northern and Southern hemisphere.
A star and all the
planets and other
objects that revolve
around it is called a
solar system.
A planet is a large body
that revolves around a
star.
The galaxy is a huge system of
gases, dust, and many stars.
A star is a
huge ball of
superheated
gases.
A pattern of
stars that form
an imaginary
picture or
design in the
sky is called a
constellation.
Optical Telescopes are used to
study faraway objects in space.
Cyclical
means to
recur in
cycles (a
series of
events that
regularly
repeat in the
same
order).
Crewed or "manned" missions
have humans aboard to control
the spacecraft and handle its
operations.
The sun
is the
star at
the
center of
our solar
Space probes are longterm satellites that have
no one aboard.
A satellite is an
artificial body
placed in orbit
around the
earth or
another planet
in order to
collect
information or
for
communication.
Reflection is the bouncing of light
off of an object.