WEBVTT

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DEAN:
HEY THERE STAR GAZERS.

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I'M DEAN REGAS, ASTRONOMER FOR THE CINCINNATI
OBSERVATORY.

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JAMES:
AND I'M JAMES ALBURY, DIRECTOR OF THE KIKA

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SILVA PLA PLANETARIUM IN GAINESVILLE, FLORIDA.

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WE'RE HERE TO HELP YOU FIND YOUR WAY AROUND
THE SKY TONIGHT.

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THE SUMMER TRIANGLE
IS RIDING HIGH IN THE SKY THIS WEEK AND IF

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YOUVE WATCHED OUR SHOW OVER THE YEARS,
YOU'LL KNOW THAT WE OFTEN TALK ABOUT TWO OF

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ITS CONSTELLATIONS; CYGNUS THE SWAN AND LYRA
THE HARP.

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DEAN:
BUT THERES A THIRD CONSTELLATION THAT

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WE HAVEN'T REALLY DISCUSSED IN DETAIL AND
THATS AQUILA THE EAGLE.

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JAMES:
THATS RIGHT, DEAN!

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SO THIS WEEK, WE'VE DECIDED TO SHOW AQUILA
SOME LOVE

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AND INTRODUCE YOU TO THE CONSTELLATION THAT
REPRESENTS ZEUS

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PET EAGLE.

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LETS SHOW YOU!

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

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SUNSET,
FACING SOUTHEAST.

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LOOKING HIGH IN THE SKY, WE SEE THE SUMMER
TRIANGLE.

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THE THREE BRIGHTEST STARS ARE VEGA, ALTAIR
AND DENEB.

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WE'RE GOING TO FOCUS ON ALTAIR, BECAUSE THAT
IS THE BRIGHTEST STAR IN THE CONSTELLATION

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AQUILA THE EAGLE.

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DEAN:
AQUILA IS BEST KNOWN AS THE PET EAGLE BELONGING

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TO ZEUS,
THE KING OF THE GREEK GODS.

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AQUILA HAD THE JOB OF HOLDING ZEUS LIGHTNING
BOLTS, BUT HE WAS ALSO KNOWN FOR KIDNAPPING

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GANYMEDE AND BRINGING HIM TO MOUNT OLYMPUS
TO BE ZEUS DIVINE DRINK SERVER.

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JAMES:
THE BRIGHTEST STAR IN AQUILA IS ALTAIR.

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ALTAIR IS
17 LIGHT YEARS FROM EARTH AND IS ONE

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OF THE CLOSEST STARS VISIBLE TO THE
NAKED EYE.

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DEAN:
ALTAIR HAS THE RARE DISTINCTION OF BEING THE

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FASTEST ROTATING STAR IN OUR NEIGHBORHOOD.

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OUR SUN FOR EXAMPLE TAKES 25 DAYS TO SPIN
ONCE, BUT ALTAIR SPINS ONCE IN ONLY 9 HOURS!

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THIS HAS RESULTED IN ALTAIR BEING SO DISTORED
THAT IT RESEMBLES AN M&M.

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DEAN:
THE SEMI-BRIGHT STAR ABOVE ALTAIR IS TARAZED.

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ITS AN ORANGE GIANT STAR 460 LIGHT YEARS FROM
US AND OVER 2500 TIMES AS BRIGHT

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AS OUR SUN.

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JAMES:
THE SEMI-BRIGHT STAR BELOW ALTAIR IS ALSHAIN

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ITS A BINARY STAR SYSTEM 45 LIGHT YEARS FROM
EARTH.

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THE PRIMARY STAR,
IS A YELLOW SUBGIANT ONLY 30% MORE MASSIVE

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THAN OUR SUN, AND THREE TIMES THE RADIUS.

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DEAN:
THE SMALLER COMPANION STAR IS A RED DWARF

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ONLY A THIRD THE MASS OF THE SUN WITH ONLY
2% OUR SUNS LUMINOSITY.

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TALK ABOUT A TINY STAR!

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JAMES:
YOU MIGHT BE SURPRISED TO KNOW THAT AQUILA

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THE EAGLE HAS 143 STARS THAT ASTRONOMERS CONSIDER
NOTEWORTHY.

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HOWEVER, ONLY A HANDFUL OF THEM YOU CAN SEE
FROM A LIGHT POLLUTED CITY.

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DEAN:
AQUILA IS ALSO ONE OF THOSE CONSTELLATIONS

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WHERE THE BAYER DESIGNATION GETS A LITTLE
WEIRD.

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DEVELOPED BY ASTRONOMER JOHANN BAYER, THE
GREEK LETTER DESIGNATION FOR STARS MOST OF

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THE TIME WAS BASED
ON THE STARS BRIGHTNESS;

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ALPHA BEING THE BRIGHTEST, BETA THE SECOND
BRIGHTEST

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AND SO ON.

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WELL, IN AQUILA THATS NOT THE CASE.

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JAMES:
THE SEVEN BRIGHTEST STARS IN ORDER OF BRIGHTNESS

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ARE,

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1.

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ALTAIR IS
ALPHA

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2.

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TARAZED IS
GAMMA

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3.

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OKAB IS -
ZETA

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4.

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ALMIZAN 3 IS
THETA

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5.

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ALMIZAN 1 IS
DELTA

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6.

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AL THALI-MAIN PRIOR
IS LAMBDA

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AND LASTLY,
7.

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ALSHAIN IS
BETA.

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DEAN:
WEIRD.

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JAMES:
DID YOU KNOW THAT AQUILA THE EAGLE THAT WE

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RECOGNIZE TODAY
IS ACTUALLY A COMBINATION OF THE ORIGINAL

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AQUILA AND
A NOW OBSOLETE CONSTELLATION THAT WAS NEARBY?

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DEAN:
THATS RIGHT, JAMES.

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LIKE BOOTES THE HERDSMAN
(THAT NOW INCLUDES THE DEFUNCT CONSTELLATION

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QUANDRANS MURALIS), AQUILA ACQUIRED THE STARS
OF THE EQUALLY DEFUNCT CONSTELLATION ANTINOUS

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.

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JAMES:
ANTINOUS WAS CREATED BY THE ROMAN EMPEROR

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HADRIAN IN 132 A.D.

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IN HONOR OF HIS YOUTHFUL COMPANION OF THE
SAME NAME .

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AS THE CENTURIES PASSED, ANTINOUS WAS LATER
DEMOTED TO AN ASTERISM WITHIN AQUILA AND EVENTUALLY

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DISCARDED WHEN THE INTERNATIONAL ASTRONOMICAL
UNION FORMALIZED THE CONSTELLATIONS IN 1930.

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DEAN:
THE STARS ALMIZAN 3, ALMIZAN 2 AND ALSHAIN

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ARE WHERE ANTINOUS USED TO BE.

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YOU CAN FIND THEM IN THE EASTERN PORTION OF
AQUILA.

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DEAN:
SO CHECK OUT AQUILA THE EAGLE AND IT'S MANY

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INTERESTING STARS TONIGHT.

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JAMES:
WOW!

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SO MANY NEAT THINGS TO SEE WHEN YOU REMEMBER
TO

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BOTH:
KEEP LOOKING UP!