«Миниатюрная Солнечная система»: японский астроном представил анимированное вращение колец Сатурна

Скорость вращения колец Сатурна зависит от их близости к планете — чем больше расстояние, тем медленнее движение. Этот принцип похож на модель вращения планет вокруг Солнца.
Каждое из семи ледяных колец Сатурна вращается в собственном темпе и ведет себя как «миниатюрная Солнечная система», утверждает планетолог Японского агентства аэрокосмических исследований JAXA Джеймс О’Донохью. В среднем скорость вращения колец вокруг планеты в 70 раз превышает скорость звука.
«В некотором смысле кольцевая система Сатурна похожа на миниатюрную Солнечную систему, — сказал Business Insider Джеймс О’Донохью. — Объекты, расположенные близко к Сатурну, вращаются быстрее — иначе они упадут, в то время как удаленные объекты могут позволить себе двигаться медленнее. То же самое происходит и с планетами Солнечной системы».
О’Донохью создал видеоанимацию, на которой показано движение каждого кольца в круговом танце.
Линия «синхронная орбита» синхронизирована с вращением самого Сатурна — она показывает, какие части колец можно увидеть, стоя на одном месте планеты продолжительное время.
Медленнее всего вращается внешнее кольцо Сатурна — со скоростью около 16,4 км/с. Это медленнее, чем вращение самого Сатурна. Внутренние кольца — глыбы льда и скал — проносятся сквозь космос со скоростью около 23,2 км/с.
Кольца Сатурна медленно исчезают, выяснил О’Донохью и его коллеги, изучая верхние слои атмосферы Сатурна. Они заметили, что каждую секунду на планету обрушиваются тысячи килограммов кольцевого материала. По словам О’Донохью, в таком темпе кольца прослужат не более 300 миллионов лет в известной нам «полной» форме.
«Кольцевая система Сатурна не совсем стабильна: она больше похожа на временное поле обломков какой-то древней Луны или кометы, которые слишком сблизились и развалились на части, а не на постоянное явление, — сказал О’Донохью. — Мы можем считать, нам повезло, что мы живем в то время, когда кольца Сатурна так полноценно присутствуют в Солнечной системе».
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