In orbital mechanics, retrograde burns (burning opposite to the direction of momentum) are essential for reducing velocity to achieve safe landings on celestial bodies like the Moon, as demonstrated by the KSP player who explains that retrograde is the opposite direction of momentum and shows how to use this principle to kill horizontal speed for a gentle lunar landing.
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Jeb is [TITLE CARD]追加:
playing KSP. This was the best decision I've ever made. Jeb, Bill, Bob, we're going to space. I want to demonstrate how to go to the moon because I'm a KSP pro. I'm probably the best player. I'm the most reliable source of info. We're going to land on the moon.
This big old juicy rocket.
That's the station.
Yeah.
I'm not going to Let's just save this.
Watch them.
They're all going to die.
I wonder if my microphone's going to pick up the amount of button mashing I'm about to do.
All right.
Uh Jeb, Bill, Bob, prepare to be sent.
All right. Now we can go full throttle.
All right.
Now we are going to go to the moon.
Look at it.
Look at that.
Look at how Look at how beautiful this is.
What are we doing?
We're piercing through the atmosphere right now.
Let's cut off the engines. Let's just coast to um apoapsis.
That's what it's called.
I'm I'm a professional.
Uh we're going to keep this resources tab open.
Yep.
All right. yeah. Yeah, man.
Doing this. Totally tubular.
This is way past radical.
All right.
I think we could get it. I think we still do that.
We used to do this do this mission, man.
Don't worry.
Just do the do the mission, man.
Way past radical, man. We're We're going to space, man.
All right.
You're in space. This small vessel is supposed to S3000.
Th- This is has enough to probably get the Duna.
That was my phone. Where's my phone? Oh, there's my phone. How How is it there? I didn't put it there. And um green bean launcher.
Yeah, I've done some little off-camera mining.
All right. What way is it even going?
Okay, it's going that way.
What I want to do is go at do the burn at periapsis.
So, we save fuel.
Not that we need to save fuel anyway. I mean, we're trying to destroy the environment. That's a That's a >> [snorts] >> That would send us out of the solar system. So, we better we better lock in on this burn. We better make sure we don't freak up, guys.
We're nowhere near close to this burn.
>> Let's give you all Let's get a little closer.
Yeah, that's about close enough. We we could still get home if we still have a free return trajectory, bro. Although, if we ran out of fuel, yeah, we're definitely going to need like a rendezvous mission, but I don't have the brain capacity to do that.
So, we're going to time warp to right here.
All right, we're going to want to point retrograde here.
This Wait, let's just check out the landing gear.
Can we land?
There is little to no room to spare. You can use planets to like um get out of the solar system.
>> [music] >> All right.
Um yeah, fine.
All right, don't we have a lander here?
Lander landed.
That was um They're not a base. Um they just got stuck there. I'm going to be honest.
Just going to orbit in and then we're going to warp here.
Going to like point retrograde here.
Now, what is retrograde? Retrograde is the opposite direction of momentum. So, this means prograde is the direction of your momentum.
What's the what's the You have got to have a collision course now.
Let's just warp down there.
Jeb is having a fantastic time.
I can just literally just let them crash.
Wait, this is actually a great place to land.
Try and kill the horizontal speed.
Uh I'm taking manual control here.
But we're cutting the horizontal speed.
Now let's point point retrograde again.
>> [music] >> We we definitely want to land.
No, no, no, no, no, no, no, no, no.
>> [laughter] >> Oh, no.
Land gently.
Houston, we have landed.
All right.
All right. All right.
All right.
Got to plant a little flag here.
Planting a little flag right here.
All right.
Uh moon isn't cheese.
All hail Jeb.
>> [screaming] >> How high does it take to kill Jeb?
Time to find out.
Let's go about a 100.
Let's add a little like pressure onto it, too.
All right. Yeah, Jeff is probably going to die. Jeff, I'm sorry.
Jeff, I don't know how fast I don't know I'm sorry.
Oh my god. How would Vince Jeff might just be in >> [music] [music] [music]
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