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JAMES: 
THIS WEEK, WE RE GOING TO TALK ABOUT A CONSTELLATION

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THAT S PART OF AN ANCIENT CELESTIAL STORY.

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DEAN: 
AND ONE OF ITS STARS HELPED ASTRONOMERS DETERMINE

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THE SIZE AND SHAPE OF OUR OWN GALAXY AND THE 
DISTANCES TO NEARBY GALAXIES.

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JAMES: 
OK, WE HAVE OUR SKIES SET FOR AN HOUR AFTER

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SUNSET, ANY NIGHT THIS WEEK, FACING 
NORTHEAST.

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YOU LL SEE THE 
W-SHAPED PATTERN OF CASSIOPEIA.

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DRAW A STRAIGHT LINE FROM THE TWO STARS AT 
THE TOP OF THE W AND

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YOU LL RUN SMACK DAB INTO CEPHEUS THE KING.

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HE LOOKS LIKE AN 
UPSIDE-DOWN HOUSE.

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DEAN: 
STARTING WITH THE BRIGHTEST STAR AND TRAVELING

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COUNTER CLOCKWISE, WE HAVE ALDERAMIN, ALFIRK, 
ERRAI, IOTA CEPHEII AND ZETA CEPHEII.

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JAMES: 
RIGHT NEXT TO ZETA CEPHEII WE HAVE DELTA CEPHEII

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AND IT WAS DISCOVERED THAT 
THIS STAR VARIED IN BRIGHTNESS

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AT REGULAR INTERVALS.

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SO MANY STARS SHOWED THIS SAME PATTERN, 
THAT IT LAID THE GROUND WORK FOR MEASURING

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DISTANCES 
IN THE UNIVERSE.

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BOTH: KEEP LOOKING UP!