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[ MUSIC ]

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>> HELLO!

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MY NAME IS SCOTT TINGLE,

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AND I'M LIVING AND WORKING

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ONBOARD THE INTERNATIONAL

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SPACE STATION.

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YOU KNOW, I LOVE MY VIEWS

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FROM THE CUPOLA.

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IT'S OUR ORBITING ALTITUDE

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OF AROUND 400 KILOMETERS

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OR 250 MILES ABOVE THE EARTH'S

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SURFACE THAT GIVE US

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THESE UNIQUE PERSPECTIVES.

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LET'S EXPLORE

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HOW OUR ISS ORBITS WORK.

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COME ON!

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FIRST, I SHOULD EXPLAIN--

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ORBITS ARE ELLIPTICAL,

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OR OVAL, IN SHAPE, WITH SOME

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BEING ALMOST CIRCULAR.

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PLANETS, COMETS, AND MOONS

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HAVE ELLIPTICAL ORBITS.

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SPACECRAFT ORBITING EARTH

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LIKE THE SPACE STATION ARE

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PLACED INTO A NEARLY CIRCULAR

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ORBIT TO KEEP A CONSISTENT

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ALTITUDE AS THEY TRAVEL

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AROUND THE PLANET.

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LET'S TAKE A LOOK AT THE EARTH.

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IT HAS A RADIUS OF

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6,378 KILOMETERS.

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AND THE STATION ORBITS

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ABOUT 400 KILOMETERS

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ABOVE THE SURFACE

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AT 8 KILOMETERS PER SECOND.

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THAT'S 17,500 MILES PER HOUR.

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SEE IF YOU CAN USE THESE VALUES

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TO CALCULATE HOW FAR--

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HOW LONG WE TRAVEL

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IN ONE ORBIT AROUND THE EARTH.

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ALL OF THIS INFORMATION

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AND MORE ACTIVITIES

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RELATED TO ORBITS ARE AVAILABLE

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IN THE ACCOMPANYING LESSON PLAN

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AT NASA.GOV/STEMONSTATION.

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>> ANSWERS COMING IN.

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>> FOUR, THREE, TWO, ONE.

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>> THE ANSWERS TO THE QUESTIONS,

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BY THE WAY, ARE APPROXIMATELY

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42,600 KILOMETERS

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IN 90 MINUTES.

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AND DUE TO OUR ALTITUDE

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ON ORBIT, WE HAVE

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OUR VERY UNIQUE AND AWESOME

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VIEW OF THE EARTH.

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THANKS FOR EXPLORING

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WITH ME TODAY.

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I'M GONNA SEND YOU

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BACK TO EARTH NOW

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SO YOU CAN START

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YOUR CHALLENGE ON ORBITS.