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중력, 케플러의 법칙, 궤도 요소, 속도, 탈출, 로켓 방정식과 어떻게 우주선 세계 사이를 여행.

NASA/JPL/Space Science Institute

  1. 뉴턴의 중력

    • Newton's gravity · 12 분

      One law explains falling apples, the Moon's orbit and the path of every planet. Fire Newton's cannon and find out how.

  2. 케플러의 법칙

    • Kepler's laws · 14 분

      Three rules found from careful observations in the early 1600s still describe every orbit, from moons to exoplanets.

  3. 궤도 요소

    • Orbital elements · 14 분

      Six numbers pin down any orbit in space: its size, shape, tilt, orientation and where the body is on it.

  4. 궤도 속도: 비스바바 방정식

    • Orbital speed: the vis-viva equation · 12 분

      One short equation gives the speed of anything in orbit at any point, if you know how far it is and the size of its orbit.

  5. 탈출속도

    • Escape velocity · 12 분

      How fast do you need to go to leave a world for good? And why rockets do not actually need to reach it at the surface.

  6. 왜 궤도가 떨어지는가

    • Why an orbit is a fall · 10 분

      Astronauts float not because there is no gravity up there, but because they are falling all the time, and missing.

  7. 궤도에 도달 : 중력 회전

    • Reaching orbit · 12 분

      Why rockets go up for only a few seconds, then spend ten minutes going sideways: the gravity turn, staging and orbital insertion.

  8. 로켓 방정식과 델타-v

    • The rocket equation and delta-v · 12 분

      Why rockets are mostly fuel, why they come in stages, and the one equation behind every mission's budget.

  9. 호만 트랜스퍼

    • Hohmann transfers: changing orbits · 12 분

      To go higher you speed up, and then you arrive slower. The two-burn manoeuvre that moves satellites from low orbit to geostationary orbit.

  10. 창 실행

    • Launch windows: the road to Mars · 12 분

      You cannot aim at Mars, only at where Mars will be in eight months. Why Mars missions leave every 26 months, all at once.

  11. 궤도 삽입: 포획되고

    • Orbital insertion: getting captured · 12 분

      Arriving at a planet is the most dangerous minute of a mission: one burn decides whether you stay or fly past forever.

  12. 중력 보조

  13. 라그랑주점

    • Lagrange points: balance in the sky · 11 분

      Five places around every pair of worlds where a spacecraft can ride along for free, and why the James Webb Space Telescope lives at one of them.

  14. 렌데부와 도킹

    • Rendezvous: catching the space station · 11 분

      To catch something ahead of you in orbit, you drop lower and go slower-looking but faster. The counter-intuitive art of meeting in space.

  15. 집으로 돌아오는: 재진입

    • Coming home: reentry · 11 분

      A small push slows a spacecraft by a hundred metres per second, and the air takes care of the other 7.8 kilometres per second, as a fireball.

  16. 돼지고기 플롯

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  17. 소행성과 혜성

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