Esta página foi traduzida automaticamente e pode conter erros. Ajude a melhorá-lo Leia o texto original em inglês
  1. Aprender
Para adolescentes e adultos curiosos

Navegador

Gravidade, leis de Kepler, elementos orbitais, velocidades, fuga, a equação do foguete e como as naves espaciais viajam entre mundos.

NASA/JPL/Space Science Institute

  1. Gravidade de Newton

    • Newton's gravity · 12 min

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

  2. Leis de Kepler

    • Kepler's laws · 14 min

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

  3. Elementos da órbita

    • Orbital elements · 14 min

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

  4. Velocidade orbital: a equação vis-viva

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

      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. Velocidade de escape

    • Escape velocity · 12 min

      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. Por que uma órbita é uma queda

    • Why an orbit is a fall · 10 min

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

  7. Alcançar a órbita: o giro da gravidade

    • Reaching orbit · 12 min

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

  8. A equação do foguete e delta-v

    • The rocket equation and delta-v · 12 min

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

  9. João Hohmann transfers

    • Hohmann transfers: changing orbits · 12 min

      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. Lançar janelas

    • Launch windows: the road to Mars · 12 min

      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. Inserção orbital: sendo capturado

    • Orbital insertion: getting captured · 12 min

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

  12. A gravidade ajuda

  13. Pontos de Lagrange

    • Lagrange points: balance in the sky · 11 min

      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. Rendezvous e docking

    • Rendezvous: catching the space station · 11 min

      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. Chegando em casa: reentrada

    • Coming home: reentry · 11 min

      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. Parcelas de porco

    Coming soon!

  17. Asteróides e cometas

    Coming soon!

As ferramentas e lições utilizam modelos simplificados apenas para aprendizagem, não devendo ser utilizados para navegação, planejamento de missões ou qualquer decisão operacional. Os certificados são gratuitos e não credenciados. Leia o aviso de conteúdo educacional