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VOCABULARY
• ELLIPSE: OVAL SHAPE OF THE PLANET ORBITS
• ORBIT/REVOLUTION: TO MOVE AROUND AN OBJECT
• ROTATION: TO SPIN ON AN AXIS
• COMET: CELESTIAL OBJECT MADE OF ICE DUST AND ROCK THAT ORBITS THE SUN.
• ASTEROIDS: LARGE ROCKS IN SPACE
• METEOROIDS: BROKEN PIECES OF ASTEROIDS AND COMETS
• METEOR: ROCK THAT STREAKS ACROSS THE ATMOSPHERE
• METEORITE: PIECE OF ROCK FROM SPACE THAT REACHES EARTH’S SURFACE.
DIFFERENCE IN MODELS
• WE USED TO THINK…
• NOW WE KNOW…
• EVERYTHING IN THE SOLAR SYSTEM
REVOLVED AROUND EARTH
• THE SUN IS IN THE CENTER OF THE SOLAR
SYSTEM.
• PLANETS AND THE SUN REVOLVED IN LITTLE
CIRCLES IN BIG CIRCLES (CORKSCREW
SHAPED)
• OUR PLANETS REVOLVE IN ELLIPSES.
COMETS
• MADE OF ICE, GAS, AND DUST
• FOUND BEYOND PLUTO IN THE OORT CLOUD
• REVOLVE AROUND THE SUN.
• HAS A TAIL AND COMA
ASTEROID
VS.
METEOROID
BOTH IN SPACE
• LARGE ROCK OR METAL IN SPACE
• FOUND IN THE ASTEROID BELT BETWEEN
MARS AND JUPITER.
• BROKEN PIECE OF ASTEROIDS AND
COMETS (SMALLER).
• FOUND IN THE ASTEROID BELT BETWEEN
MARS AND JUPITER.
METEORS
• METEOROID THAT REACHES THE
ATMOSPHERE.
• SHOOTING STARS
VS
METEORITE
• METEOR THAT REACHES EARTH’S SURFACE.
OBJECTS IN SPACE
• UNIVERSE: SPACE AND EVERYTHING IN IT.
• GALAXY: BILLIONS OF STARS, GAS, AND DUST LOOSELY HELD TOGETHER BY
GRAVITY.
• SOLAR SYSTEM: STAR AND EVERYTHING THAT REVOLVES AROUND IT
• STAR: A GIANT BALL OF GAS THAT PRODUCES LIGHT
• PLANET: A ROUND OBJECT THAT ORBITS A STAR.