កម្មវិធី​រុករក

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   កម្លាំង​ទាក់​ទាញ​របស់​នីវ៉ូត

   • Newton's gravity · 12 នាទី

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

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   ច្បាប់​របស់ Kepler

   • Kepler's laws · 14 នាទី

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

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   ធាតុ​អ័ក្ស

   • Orbital elements · 14 នាទី

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

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   Orbital speed: the vis-viva equation

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

     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.

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   ល្បឿន​គេច

   • Escape velocity · 12 នាទី

     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.

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   ហេតុ​អ្វី​បាន​ជា​អ័ក្ស​ធ្លាក់

   • Why an orbit is a fall · 10 នាទី

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

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   Reaching orbit: the gravity turn

   • Reaching orbit · 12 នាទី

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

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   សមីការ​រ៉ុក្កែត និង delta- v

   • The rocket equation and delta-v · 12 នាទី

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

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   ការ​ផ្ទេរ Hohmann

   • Hohmann transfers: changing orbits · 12 នាទី

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

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    ចាប់ផ្ដើម​បង្អួច

    • Launch windows: the road to Mars · 12 នាទី

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

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    Orbital insertion: getting captured

    • Orbital insertion: getting captured · 12 នាទី

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

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    ជំនួយ​របស់​កម្លាំង​ទម្ងន់

    • Gravity assists: the free slingshot · 12 នាទី

      How Voyager, Cassini and New Horizons stole speed from planets, and why it never breaks the conservation of energy.

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    ចំណុច​ឡាហ្គ្រែន

    • Lagrange points: balance in the sky · 11 នាទី

      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.

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    ជួប​គ្នា និង​ដាក់​នៅ​ចត

    • Rendezvous: catching the space station · 11 នាទី

      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.

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    Coming home: reentry

    • Coming home: reentry · 11 នាទី

      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.

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    គ្រោង Porkchop

    កំពុង​មកដល់

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    ផ្កាយ​រណប និង​ភព​ព្រះច័ន្ទ

    កំពុង​មកដល់

Tools and lessons use simplified models for learning only. They must not be used for navigation, mission planning or any operational decision. Certificates are free and non-accredited. អាន​ការ​លុបចោល​មាតិកា​អប់រំ