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  • We did what we came here to do

  • and now it's time to head home.

  • Before take off,

  • let's talk about the Lunar Module a little more.

  • It was split up into two stages

  • The Descent Stage got us safely to the surface,

  • but now it's dead weight and will be left behind

  • on the surface of the Moon.

  • The Ascent Stage has it's own propulsion system, which

  • is what gets the two Astronauts safely back into orbit.

  • Don't forget about our one lonely Astronaut, who's still

  • orbiting above us in the CSM.

  • What I'm about to explain is called Rendezvous and Docking.

  • I'm going to change the Moon's scale here,

  • so we can show this a little better.

  • Lift off, will need to happen at just the right time.

  • The Ascent Stage fires up for about

  • seven and a half minutes.

  • This gets us initially back into Lunar Orbit.

  • Several short engine burns happen over the next

  • three and a half hours.

  • It takes almost two orbits before Docking can happen.

  • On later Apollo Missions, they were able to do this in

  • less than one orbit.

  • After the LM and CSM are docked,

  • all valuables are transferred to the Command Module.

  • It's time to say goodbye to the LM Ascent Stage;

  • it was either left floating in Lunar Orbit,

  • or intentionally smashed into the Moon.

  • It's now time to head home;

  • this is very similar to what we've done before.

  • On the far side of the Moon, the Service Module Engine

  • fires up for about two and a half minutes.

  • This is called the Trans-Earth Injection.

  • It was a three day journey to get back home.

  • Remember that the Service Module contains things like

  • the oxygen tanks and fuel cells;

  • you can't actually go inside.

  • This means that all three Astronauts are in the

  • Command Module for the remainder of the journey.

  • Sure hope no one gets claustrophobic.

  • Once we're back in Earth Orbit,

  • the Service Module is no longer needed.

  • We started with the giant Saturn Five Rocket

  • and now the Command Module is the only part

  • that returns safely to Earth.

  • The climax of the whole mission is called Re-entry.

  • All this time the Service Module was protecting

  • what's on the bottom side of the Command Module,

  • the Heat Shield.

  • Re-entering the Earth's atmosphere is dangerous

  • because of the enormous heat it causes.

  • The Heat Shield protects the Command Module for

  • several minutes as it passes through the atmosphere.

  • Down below, an Aircraft Carrier waits for the

  • Astronaut's arrival.

  • Once we get about two miles above the surface,

  • the parachutes are deployed to slow us down even more.

  • The hard part is over.

  • now, we just enjoy the ride.

  • The final part of every Mission...

  • Splashdown.

  • Half a million miles,

  • one Lunar landing,

  • and three youtube videos later.

  • We made it.

  • Thanks for sticking with me.

  • If you've enjoyed learning about the Apollo Spacecraft,

  • please consider sharing these videos on social media.

  • Don't forget to Like and Subscribe.

  • My name's Jared Owen.

  • Thanks for watching.

We did what we came here to do

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B1 US module orbit lunar apollo moon stage

How the Apollo Spacecraft works: Part 3

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    joey joey posted on 2021/04/26
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