Navigator

1. 1

   Cidhiidhiga Newton

   • Newton's gravity · 12 daqiiqo

     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

   Xeerarka Kepler

   • Kepler's laws · 14 daqiiqo

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

3. 3

   Qaybo

   • Orbital elements · 14 daqiiqo

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

4. 4

   Xawaaraha wareega: isku-dhafka vis-viva

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

     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

   Xawaaraha ka bax

   • Escape velocity · 12 daqiiqo

     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

   Maxaa sababay in orbit waa hoos u dhac

   • Why an orbit is a fall · 10 daqiiqo

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

7. 7

   Gaadhsiinta orbit: wareegga culeyska

   • Reaching orbit · 12 daqiiqo

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

8. 8

   Isku-dhafka roketka iyo delta-v

   • The rocket equation and delta-v · 12 daqiiqo

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

9. 9

   Hohmann wareejinta

   • Hohmann transfers: changing orbits · 12 daqiiqo

     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

    Bilow daaqadaha

    • Launch windows: the road to Mars · 12 daqiiqo

      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

    Ku dar orbital: la qabsaday

    • Orbital insertion: getting captured · 12 daqiiqo

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

12. 12

    Gargaarka culeyska

    • Gravity assists: the free slingshot · 12 daqiiqo

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

13. 13

    Lagrange

    • Lagrange points: balance in the sky · 11 daqiiqo

      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

    Rendezvous iyo docking

    • Rendezvous: catching the space station · 11 daqiiqo

      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

    Gurigiisa u soo laabtay:

    • Coming home: reentry · 11 daqiiqo

      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

    Porkchop dhul

    Soo socda

17. 17

    Asteroids iyo comets

    Soo socda

Qalabka iyo waxbarasho isticmaalaan qaabab fudud oo loogu talagalay barashada kaliya. Waxayna waa in aan loo isticmaalin navigation, qorsheynta howlgalka ama go'aan kasta oo hawleed. Certificates waa bilaash ah oo aan la aqoonsan. Akhri qoraalka ka digay waxbarashada