{"group":"life","pic":"living/pics/sports-city.webp","question":"What is sport like when you weigh a third as much?","answer":"Higher, longer, slower to fall. Every jump climbs {jump_x} times as high, so Arcadia's hoops are raised to {sp_rim_m} m and a dunk feels like flying.","play":{"label":"Shoot hoops on the Mars court","href":"play/?at=0,-92,0,0.28,8&era=city&light=day"},"leap":{"title":"The same jump, two worlds","line":"Two people push off the floor exactly as hard. Watch who comes down first.","earth":"Earth","mars":"Mars","up":"Height","air":"In the air","again":"Jump again","scale":"Heights drawn to scale"},"court_title":"The court under glass","court":[{"icon":"wave","title":"A roof of water","text":"About {roof} m of water between two skins of glass stops the radiation, so a game can last all afternoon, lit by rippling blue light."},{"icon":"target","title":"Hoops at {sp_rim_m} m","text":"Raised so a dunk takes the same leap it does on Earth. Shots keep the same ring and ball."},{"icon":"helmet","title":"In through an airlock","text":"Walk in through the lock, take your helmet off and play in your everyday clothes."},{"icon":"people","title":"Seats for the crowd","text":"When someone scores, the whole stand hops to its feet in slow motion."}],"rim":{"title":"Why the hoop is {sp_rim_m} m","line":"A player of average NBA height reaches {sp_reach_m} m. On Earth the rim is {sp_rim_e} m above the floor. Here the same push lifts you {jump_x} times as high, so the rim goes up to {sp_rim_m} m and the dunk takes the same effort.","reach":"Reach","rim":"Rim","earth":"Earth","mars":"Arcadia","leap":"Leap"},"flight":{"title":"Same push, longer flight","line":"From the same push, a jump on Mars hangs {sp_hang_m} s in the air instead of {sp_hang_e} s: long enough to turn, look and choose your shot.","time":"seconds","height":"metres"},"earth_mars":{"earth":{"head":"You come down fast"},"mars":{"head":"You float back down"},"pics":{"earth":"living/pics/em-sports-earth.webp","mars":"living/pics/em-sports-mars.webp"},"rows":[{"label":"Your weight","icon":"walk","earth":"Your full weight pulls you back to the ground.","mars":"You weigh {g_pct}% of what you weigh at home."},{"label":"A standing jump","icon":"spark","earth":"About {sp_jump_e} m off the ground.","mars":"About {sp_jump_m} m: your feet reach chest height."},{"label":"Time in the air","icon":"bar","earth":"About {sp_hang_e} seconds.","mars":"About {sp_hang_m} seconds, long enough to look around."}]},"pin":[0.38,0.27],"scene":{"pic":"living/pics/scene-sports.webp","look":"05-17","shot":"stands","focus":"50% 50%","spots":[{"at":[0.3,0.08]},{"at":[0.62,0.27]},{"at":[0.06,0.53]},{"at":[0.88,0.72]}]},"proof":{"pic":"living/people/sports-proof.webp","place":"The Moon","when":"{young_date}","head":"A salute in mid-air","credit":"Photo: Charlie Duke, NASA (public domain)"},"fact":"On the Moon, where gravity is weaker still, the astronaut John Young leapt about {young_cm} cm off the ground in his full spacesuit and backpack to salute the flag. His crewmate caught him in mid-air with the camera.","quiz":[{"q":"How much higher does the same jump go on Mars?","a":["About {jump_x} times as high","About the same","About ten times as high"],"why":"Mars's gravity is {g_pct}% of Earth's, so the same push carries you {jump_x} times as high.","more":"A fall from a first-floor window here lands like a fall from a kitchen worktop on Earth.","cite":"02-01 F-01, S-02","from":"problem","fig":0,"icon":"spark"},{"q":"How high is the rim on Arcadia's court?","a":["{sp_rim_m} m","{sp_rim_e} m, the same as on Earth","Five metres"],"why":"Raised from Earth's {sp_rim_e} m so that a dunk takes the same leap it does at home.","more":"The court's roof holds about {roof} m of water, as deep as a diving pool, and it glows blue all day.","cite":"05-19 PA-07, 03-10 GF-17","from":"fix","fig":1,"icon":"target"},{"q":"How long does a standing jump keep you in the air on Mars?","a":["About {sp_hang_m} seconds","About {sp_hang_e} seconds","About five seconds"],"why":"The same push hangs {jump_x} times as long, because gravity pulls you back down more gently.","more":"Out on the plain, a racing buggy needs about {jump_x} times as far to stop, so the best drivers race like rally drivers on ice.","cite":"02-01 F-01, 05-17 LV-07","from":"why","fig":1,"icon":"bar"}],"notes":[{"beat":"fix","text":"Outdoors, Arcadia races dune buggies. Off a crater rim a buggy flies {jump_x} times as far as on Earth, and the sand it throws falls in clean arcs.","cite":"05-17 LV-07"}],"everyday":{"title":"A game day","items":[{"time":"09:00","head":"Shootaround","text":"Morning practice under the water roof, the floor dancing with blue light.","tag":"{g_pct}% of your Earth weight","pic":"living/pics/sports-city.webp","pos":"50% 40%"},{"time":"15:30","head":"Buggies on the rim","text":"Out on the plain the racers launch off a crater rim and land a long, slow second later.","tag":"{jump_x} times the air","pic":"living/pics/buggy.webp","pos":"50% 40%"},{"time":"19:00","head":"The big game","text":"The stands are full, the lights go coral and teal, and the whole dome jumps when the home side dunks.","tag":"Rim at {sp_rim_m} m","pic":"living/pics/sports-far.webp","pos":"55% 40%"}]},"living":"Saturday at the court: a pick-up game at the far hoop, children learning to float a lay-up, and the crowd rising in slow motion every time someone flies to the rim. Then everyone heads out to watch the buggies throw clean arcs of sand off the crater rims.","from":"From the court","later":{"pics":{"city":"living/pics/sports-city.webp","far":"living/pics/sports-far.webp"},"city":{"tag":"The court under glass","text":"One water-roofed dome, raised hoops, two rows of benches and warm lights along the edges."},"far":{"tag":"The arena","text":"Raised stands, coral and teal lights, team banners and trees round the court."}}}