መቅጃ

1. 1

   የኒውተን ግራፊክስ

   • Newton's gravity · 12 ደቂቃዎች

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

2. 2

   የኬፕለር ሕጎች

   • Kepler's laws · 14 ደቂቃዎች

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

3. 3

   ቅርጽ

   • Orbital elements · 14 ደቂቃዎች

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

4. 4

   የኦቢቲካል ፍጥነት:

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

     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. 5

   የፍጥነት መለኪያ

   • Escape velocity · 12 ደቂቃዎች

     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. 6

   ለምን የራሱን ዞን መተው ነው?

   • Why an orbit is a fall · 10 ደቂቃዎች

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

7. 7

   የግራፊክስ ቅርጸት

   • Reaching orbit · 12 ደቂቃዎች

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

8. 8

   የሮኬት እኩልነት እና ዴልታ-ቪ

   • The rocket equation and delta-v · 12 ደቂቃዎች

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

9. 9

   መተላለፊያ

   • Hohmann transfers: changing orbits · 12 ደቂቃዎች

     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. 10

    መስኮቶች

    • Launch windows: the road to Mars · 12 ደቂቃዎች

      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. 11

    መተላለፊያ

    • Orbital insertion: getting captured · 12 ደቂቃዎች

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

12. 12

    ግራቪቲ

    • Gravity assists: the free slingshot · 12 ደቂቃዎች

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

13. 13

    ላግሬን

    • Lagrange points: balance in the sky · 11 ደቂቃዎች

      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. 14

    ሬንዴቮስ እና ዶክ

    • Rendezvous: catching the space station · 11 ደቂቃዎች

      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. 15

    ወደ ቤት መምጣት:

    • Coming home: reentry · 11 ደቂቃዎች

      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. 16

    መተላለፊያ

    በቅርቡ

17. 17

    አታሚዎች

    በቅርቡ

የጥናት መሳሪያዎች እና ትምህርቶች ለመማር ብቻ ቀላል ሞዴሎችን ይጠቀማሉ. ለመሻገር፣ ለሚሽን ዕቅድ ወይም ለየትኛውም ኦፕሬሽናል ውሳኔ ሊውሉ አይገባም. የምስክር ወረቀቶች ነፃ ናቸው እና ያልተጠበቁ ናቸው። የሥልጠና ይዘት ማረጋገጫን አንብብ