Neil deGrasse Tyson explaining the rocket equation

#shorts
maybe subscribe, but definitely like the video

[alistor]

This problem is sometimes referred to as "The tyranny of rockets"

[bourbonrebel]

NDT: “1 pound of fuel for 1 pound of fuel.”

Subtitle: “£1”

[HaraldHofer]

The guy who typed the subs didn't understand a single thing...

[jumboegg]

Similar problem occurs with electric vehicles, (especially flying ones). Doubling the size of the battery doesn't get you twice as far, because the battery weighs twice as much.

[jonsimpson]

It's the old logistics problem. When armies travel, with supply mules or wagons or train cars or planes, you get this problem. You need supplies and equipment to move the supplies and equipment.

[zlamanit]

This example is wrong. If 1 unit of fuel is enough to get 1 unit of mass into orbit, then to take 2 units of mass you just need to double the fuel (imagine you just use 2 independent rockets as you have before).

That 1 unit of fuel already has enough energy to rise itself and the payload.

What he's talking about is if you want to double the delta v. If you want to go twice as fast, then the rocket equation kicks in.

[imalonelyman]

What I took from this is that they need fuelling stations in space

[OctagonalSquare]

That’s why only the most necessary stuff goes in the rockets and shuttles. Can’t afford useless items

[Pdhub_]

In simple wording you need extra fuel to carry the original fuel cuz the fuel is also a weight which needs to be carried.

[CristianGeorgescu]

Incorrect... You need two pounds of fuel to put two pounds of payload INTO THE SAME ORBIT. Obviously you can send two rockets. However, to send one pound of payload TWICE AS FAR, then you need 3 pounds of fuel - that's probably the example they wanted.

[Sourdcuo]

Does anyone else get stuck adding fuel forever when they do the calculation? Cause if you want fuel for the fuel you’re gonna need fuel for that fuel. But If you add fuel for that fuel you’re gonna need more fuel for that fuel, which is gonna require you to add more fuel, which is gonna need more fuel- see what I mean?

[jimhughes]

This math breaks my head. 1lb payload with 1lb fuel is actually 2lbs so you need another lb of fuel. But then you actually weigh 3lb. So you need yet more fuel, right? Is this not possible?

[arilefebre]

because of the subtitles i deadass thought he meant the currency instead of the weight ;-;

[TheJimtanker]

"We don't have filing stations in space."
Elon Musk - "Yet!"

[npepe]

Homie just learned what a factorial was

[rockstardonut]

I was trying to explain to my economics teacher once that airliners never fill up their tanks like you fill up your car, because you need to burn extra fuel to carry that useless fuel. So airlines and pilots carefully calculate how much they need. Also plane can't be full of cargo AND people AND fuel at the same time. He couldn't comprehend it.

[johnmack]

Neil. You're wrong. Plain and simple.

[Toxodos]

Sometimes I still get surprised by the ways that subtitles can be wrong

[OregonDARRYL]

95% of the Shuttle's takeoff weight was fuel - used to lift mostly fuel.

[anjelcuara-starnes]

They have to combat the weight of fuel with more fuel wtf