SATELLITE
AN OBJECT THAT MOVES AROUND ANOTHER OBJECT IN SPACE; THE MOON IS A SATELLITE OF EARTH
ORBIT
THE PATH THAT AN OBJECT SUCH AS A PLANET MAKES AS IT REVOLVES AROUND A SECOND OBJECT
PHASE
ONE IF THE DIFFERENT SHAPES THE MOON SEEMS TO HAVE AS IT ORBITS AROUND EARTH
REVOLUTION
THE MOVEMENT OF ANY OBJECT IN AN ORBIT, SUCH AS EARTH MOIVING AROUND THE SUN
AXIS
AN IMAGINARY LINE WHICH RUNS THROUGH BOTH POLES OF A PLANET
ROTATION
THE MOTION OF A PLANET OR OTHER OBJECT AS IT TURNS ON ITS AXIS
SOLAR SYSTEM
A GROUP OF OBJECTS IN SPACE THAT MOVE AROUND A CENTRAL STAR
STAR
A HUGH, BURNING SPHERE OF GASES; FOR EXAMPLE, THE SUN
PLANET
A LARGE OBJECT THAT MOVES AROUND A STAR
ASTEROID
A SMALL RIOCKY OBJECT THAT MOVES AROUND THE SUN
COMET
A SMALL MASS OF DUST AND ICE THAT ORBITS THE SUN IN A LONG, OVAL-SHAPED PATH
INNER PLANET
THE PLANETS CLOSEST TO THE SUN; MERCURY, VENUS, EARTH AND MARS
OUTER PLANET
THE PLANETS FARTHEST FROM THE SUN; JUPITER, SATURN, URANUS, NEPTUNE AND PLUTO
GAS GIANT
PLANETS WHICH ARE LARGE SPHERES MADE UP MOSTLY OF GASES; EXAMPLE. JUPITER, SATURN, URANUS AND NEPTUNE
TELESCOPE
A DEVICE PEOPLE USE TO OBSERVE DISTANT OBJECTS WITH THEIR EYES
SPACE PROBE
AN UNCREWED SPACE VEHICAL THAT CARRIES CAMERAS, INSTRUMENTS, AND OTHR RESEARCH TOOLS