A SOLAR SYSTEM: A STAR AND THE NATURAL OBJECTS THAT MOVE AROUND IT, A PLANET: A VERY BIG ROUND OBJECT THAT TRAVELS AROUND THE SUN, A MOON: A NATURAL OBJECT WHICH TRAVELS AROUND A PLANET, AN ASTEROID: A BIG PIECE OF ROCK THAT TRAVELS AROUND THE SUN, A COMET: A SMALL FROZEN BALL WHICH SOMETIMES HAS A BRIGHT TAIL, TO ORBIT: TO TRAVEL AROUND A STAR OR A PLANET, SPACE MISSION: A JOURNEY INTO SPACE, TO DO A SPECIAL JOB,

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