Why Rockets Don't Fly Straight Up

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Why don’t rockets fly straight up? Neil deGrasse Tyson and comedian Chuck Nice explain the curious flight paths of rockets, how they get into orbit, and the Brachistochrone problem.

What are the major differences between airplanes and rockets? We discuss rocket fuel, hydrogen fuel, and when rockets execute the roll program. Learn about how rockets get into orbit and how it looks like the Bernoulli brother’s Brachistochrone problem.

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Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic co-hosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up!

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Timestamps:
00:00 - Rockets v. Airplanes
3:15 - Executing the Roll Program
5:42 - How Rockets Get Into Orbit
7:05 - The Brachistochrone Problem

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Did you watch the recent Starship test launch?

StarTalk

I love how profound his off-the-cuff statements are: "When you're curious and you're mathematically literate and you know a little bit of physics, these questions come up in your life, and you're compelled to solve them." Perfect wording to convey why math and science are so important in a practical sense. Great episode!

aaronscott

Sometimes I realize how much Chuck has learned… dude is VERY educated on these topics now. He’s always been bright, and now he’s bright AND educated. What’s a combo

beau-urns

This is the first time I've ever heard of the Brachistochrone problem, and then when you flipped it up side down for the orbit solution it blew my mind! Loved it! Thanks guys <3

silentblackhole

The new "edited" videos are much better than the past non-edited videos. Please, keep investing on that. Love you guys! Been watching you since the big bang

hidasineto

Hi guys! It's RJ, while I was watching this video I noticed something I found very relatable so I figured I'd share my thoughts and findings with you and absolutely excited to do so.I've been skateboarding for going on 30 years and I can confirm that dropping in ( rolling down) a quarter pipe ( quarter circle ramp) one definitely obtains more speed than if one was dropping in on a bank ramp (triangle ramp) that is the same height so long as all other variables are the same, no matter what human powered vehicles happens to be their psychotic hearts desire from bikes to scooters, roller blades and my personal favorite skateboards the results are the same. As a long time and multiple account subscriber ( not great with passwords lol) and lifetime learner I want to thank you both for making learning fun and things like science and physics approachable not just for myself and my 4 boys but for so many others Thank you Neal, Thank you Chuck .I hope that you two continue to do what you do for many years to come!

RandomInTheChat

Love watching star talk. Learn, laugh and get my mind blown everytime ❤❤❤

RiseOfTheNew

Out of the scientists of our era I feel that Neal D. Tyson is one of the most open-minded and honest of them. He's very unbiased which is a trait of a great scientist. Nothing is impossible to him and I love how he breaks everything down for us. I have quite a bit of respect for this man I appreciate what he does and the true person that he is.

DonCarlione

The reason for the brachistochrone curve in space flight is not immediately obvious, however. The reason to go vertical in the beginning is to get clear of the dense atmosphere as quickly as possible to reduce drag.

jesperlett

Terrific explainer Neal! Like many others, I never knew the exact way a rocket was launched into space. Thanks & I hope that you, Chuck & your families have a terrific Turkey Day & Happy Holidays. 👍👍🦃🦃🌲🌲

sapelesteve

For those wondering how they came up with the word 'brachistochrone'. It is from 'brachis' = 'βραχύς' in greek and its meaning is 'sort' combined with 'chrone', 'chronos' from the greek word 'χρονος' which translates to 'time'. Βραχυχρόνιο = sort time. We use this word even in the modern greek.

nickdsp