Based on where the moon is in its orbit (it's not always exactly the same distance from earth) and how far they're going around the moon, it will put them at a farther distance from the earth than any of the Apollo astronauts ever went. They say that, when they reenter Earth's atmosphere, they're going to be doing the fastest reentry ever, which means it'll be the fastest any human has ever moved (at least relative to the Earth)
I just hope, when they get to the far side of the moon, that they have to balls to say on the radio..."we've reached the far side of the moon, now how about releasing those Epstein files!". Instant legend.
It was several people, and moreso Kepler. Kepler formulated the elliptical descriptions of orbits based in large part on Brahe's meticulous observations. What newton did is tie things together via gravity.
I don't know physics but would the moons path or anything change because of the introduction of a new satellite for a moment? The rocket is just using the moons gravity, so shouldn't affect anything, right?
It does alter the path of the moon, but the change is way too small to measure. Remember, too, the moon also gets hit by meteors, like earth does, which alters the path to an infinitesimal degree.
I feel like it's one of those there's where technically, to the degree of some tiny-tiny decimal it affects it, but not to any meaningful degree. The difference in mass is pretty large.
What others have said, what you're saying is technically correct, but in the same way that it's technically correct to say that a marble has a gravitational effect on a human.
Yes. But the total effect is if you are running along, and a mosquito bounces off your forehead. How much do you slow down? OK, now think less than that. Much less.
Ok question, how much fact do u want. Cuz yes. It will. Each item, any item, anything with mass, also affects gravity and hence, affects the pull on other objects in space, so yes indeed, the spacecraft DID affect the moons gravity and(by consequence) the orbital path. But to SHOW how much effect it had, U would likely need a couple thousand decimal points (And multiple quantum computers) to calculate how much, or if said effect would even be noticed in the next 15trillion years....
So... for easier TLDR version. NO. By way of saying that it has/had ZERO effect (by which I mean as close to zero without actually BEING zero) on the moon. But (VeryLongLoveToRead version) yes it did, BUuuuuuut....
Not really. There's only 2 things you need to work out any equation. 1) gravity is a bitch and you can't stop it. 2) speed of light is a road block on whatever you think you can do. There is also an addendum, "In space, no-one can hear you scream."
I was in the 2nd year of graduate school in Physicx for an MS degree, and *that* is when I learned how to be a rocket scientist, and it happened in 90 minutes. Thanx, Dr. Brehme! It's a great story and perhaps I could tell you sometime.
Physics was great right up until differential equations when they were like "1+1=2 right? but if we subtract a + sign from each side we get 11=1-+ and from this we can calculate why a rope sages in the middle"
One of the best parts of learning physics was learning that solving differenial equatiion didn't matter anymore since they'd already been solved. We happily just worked with the results.
It’s not really “hard” so much as it’s just “weird”…
You don’t drain fuel; you push it out. You don’t go down to go lower; you go backwards. You don’t speed up to go higher; you increase drag. And just in case you need more energy, you can just steal some from a nearby rock.
There’s math for all that, and tools to assist… but mostly it’s just knowing that spaceflight is an unusual case for all the usual physics rules.
You do speed up to go higher. Speeding up in any part of a non-hyperbolic orbit will increase the altitude of your apoapsis, periapsis, or both, depending on your position in the orbit. Not sure what you mean by increasing drag being linked to speeding up?
So that one’s real fun, though I forget the exact timing details… It’s a cheap way for satellites to raise to a higher orbit.
Increasing drag (such as by angling solar panels) at the right time in the orbit changes eccentricity with a disproportionate change in kinetic energy. Periapsis lowers, but apoapsis raises, essentially for free.
With a small burn at periapsis, the Oberth effect magnifies the altitude gain, then a small burn at the following apoapsis circularizes again.
Burning for oberth, then using aero forces to raise peri makes sense. I would imagine that would still lower your average altitude, if less so than the dip into a lower peri would. Definitely still a huge benefit to keep your craft out of thicker air without spending any fuel if reaction wheels can handle it.
No joke. I literally did this. Played KSP. Loved it, went to grad school to finish up my masters degree in astronautics. I haven't used my degree for space stuff, but it was fun to master KSP!
cattlegrazer82
I see where they got lost for a minute. Been there.
Blackfinity
This just makes what they accomplished in the Apollo program all the more impressive.
GoodGuyGonzo
Musicosity
Dang, can you not comment from your favorite folders on mobile anymore? ReverseofthisGIF.gif
TerribleAwful
IfYouBelieveYouCan
What is this movie?
baals
https://media0.giphy.com/media/v1.Y2lkPWE1NzM3M2U1bHk2c3JqaWV1NXk5bjJ5ZWkwNTk2bDBnN2hqZXh5a2thZjFxd2tnOCZlcD12MV9naWZzX3NlYXJjaCZjdD1n/ER4qlfNMUkoBa/200w.webp
SpaceForGold
MATH!
stevelite
https://media3.giphy.com/media/v1.Y2lkPWE1NzM3M2U1c2d3M3BsZHJhcmpkdDQ2dXByOGdjaWdpdWxncTc1ZnZ5aGpla29zdiZlcD12MV9naWZzX3NlYXJjaCZjdD1n/13CZvcyiCe23uw/200w.webp
Trimule
from this illustration, I don't get the "farthest distance from Earth man has been" thing. What am I missing?
sehven
Based on where the moon is in its orbit (it's not always exactly the same distance from earth) and how far they're going around the moon, it will put them at a farther distance from the earth than any of the Apollo astronauts ever went. They say that, when they reenter Earth's atmosphere, they're going to be doing the fastest reentry ever, which means it'll be the fastest any human has ever moved (at least relative to the Earth)
Trimule
TrumpRapesAndEatsChildren0002
Crossing the moon trajectory is gonna be like "Oh shit, we gotta go back, forgot the batteries for the camera!"
Wuz314159
I like how they impact with the Earth and end all of existence. Ò_o
bripi
you're an idiot
BeaverOnFire
Magpiebones
https://media1.giphy.com/media/v1.Y2lkPWE1NzM3M2U1ZTIxZnd0a25lbzd5NXc4aXdrbHIxdGtlZ2J2d3Q3OHg4aG9nYmdpYiZlcD12MV9naWZzX3NlYXJjaCZjdD1n/aVUZCRPzNE3R9VGk1z/200w.webp
3Davideo
Sliding the maneuver node around until they get an interception target
0RumRunner
Definitely time I spun up Kerbal Space Program again.
parabolic000
Children of a Dead Earth is a fun game. Hard af, but really instructive on orbital mechanics.
canadaslittlereader
Looks like they are gonna get hit by the moon, very risky
Lvaneede
After this mission are they planning to land on the moon again?
Pphunk77
Here’s some real time info on where they are., currently less that 180,000 miles away from the moon. https://www.youtube.com/live/6mtZ4mN-zhw?si=fRLdo-1k3-Vm_B1u
KT8819
I just hope, when they get to the far side of the moon, that they have to balls to say on the radio..."we've reached the far side of the moon, now how about releasing those Epstein files!". Instant legend.
soundvideolighting
https://media1.giphy.com/media/v1.Y2lkPWE1NzM3M2U1YTBjbGVrc2piNnFsNW5sYXN1dm80Z3Z4bDBiaWU3NW8ycnB6YWYxeCZlcD12MV9naWZzX3NlYXJjaCZjdD1n/iJgRh1ViMltM0sCcRB/200w.webp
stronomer
Orbital dynamics experts are amazing. Lots of very un-intuitive paths.
stronomer
(But our orbital dynamics people are from ESA :-)
ShimmerinStrider
Hitting a moving target, while in motion.
CausticCake
They forgot to yell Kobe during launch. That's why they ricocheted back to Earth.
whatsisname
It helps when the motion is very predictable and doesn't change suddenly.
ShimmerinStrider
True. Just remember it took Newton to figure that one out.
whatsisname
It was several people, and moreso Kepler. Kepler formulated the elliptical descriptions of orbits based in large part on Brahe's meticulous observations. What newton did is tie things together via gravity.
ShimmerinStrider
You're not wrong. Newton just slammed the book down on everyone.
ihavethelowground
Single digit velocity seems kinda slow, no?
CaptSchmidtGaming
sure but those dots are really only moving a small distance on your screen
GuyWithDog
Not according to the unit. We usually see m/s, not km/s so factor 1000 higher
Samja192
I suppose any velocity they gain they have to slow down from - might not be practical to go too fast
Mithi
This! Every drop of fuel comes with a price, so you accelerate as little as possible.
Shaddak
It's listed in kilometers per second. 1 kilometer per second = 2236.9 miles per hour.
SwampApe75
fformulaa
I don't know physics but would the moons path or anything change because of the introduction of a new satellite for a moment? The rocket is just using the moons gravity, so shouldn't affect anything, right?
sehven
https://what-if.xkcd.com/146/
fformulaa
Love that dude! So smarts and dumbs it down so nicely that i can understand it!
boumboum34
It does alter the path of the moon, but the change is way too small to measure. Remember, too, the moon also gets hit by meteors, like earth does, which alters the path to an infinitesimal degree.
d3jake
I feel like it's one of those there's where technically, to the degree of some tiny-tiny decimal it affects it, but not to any meaningful degree. The difference in mass is pretty large.
ShimmerinStrider
You got it
UprootedGrunt
Yes, technically. But their relative masses are so different that it effectively doesn't matter.
naeddyr
What others have said, what you're saying is technically correct, but in the same way that it's technically correct to say that a marble has a gravitational effect on a human.
SomeDetroitGuy
The difference in mass is so ridiculously enormous that there wouldn't be any practical effect.
ptrimg
Yes.
But the total effect is if you are running along, and a mosquito bounces off your forehead. How much do you slow down?
OK, now think less than that. Much less.
HoneNathan
And the mosquito doesn't even touch you, it just flies past you.
AtmaDarkwolf
Ok question, how much fact do u want. Cuz yes. It will. Each item, any item, anything with mass, also affects gravity and hence, affects the pull on other objects in space, so yes indeed, the spacecraft DID affect the moons gravity and(by consequence) the orbital path. But to SHOW how much effect it had, U would likely need a couple thousand decimal points (And multiple quantum computers) to calculate how much, or if said effect would even be noticed in the next 15trillion years....
AtmaDarkwolf
So... for easier TLDR version. NO. By way of saying that it has/had ZERO effect (by which I mean as close to zero without actually BEING zero) on the moon. But (VeryLongLoveToRead version) yes it did, BUuuuuuut....
Gindipple
F=ma
DrLOAC
Actually in this case it’s F = (G*m1*m2)/r^2.
pr0t34n
If I'm being honest, rocket science seems hard
jwillywill
Orbital Mechanics
TsubakiTragic
Not really. There's only 2 things you need to work out any equation. 1) gravity is a bitch and you can't stop it. 2) speed of light is a road block on whatever you think you can do. There is also an addendum, "In space, no-one can hear you scream."
That is all... oh yeah, musk is a fucking idiot.
VincitQuiSeVincit
If I'm hard, being rocket seems honest.
Isthe4thtimethecharm
How hard can it be. I heard about a tangerine who learned everything there was to know about it in 30 minutes. /s on believing the tangerine.
kahlas
This isn't rocket surgery. It's orbital mechanics. Which is pure math. This is just a potting of that math for visual reference.
bripi
I was in the 2nd year of graduate school in Physicx for an MS degree, and *that* is when I learned how to be a rocket scientist, and it happened in 90 minutes. Thanx, Dr. Brehme! It's a great story and perhaps I could tell you sometime.
barnwolf
Physics was great right up until differential equations when they were like "1+1=2 right? but if we subtract a + sign from each side we get 11=1-+ and from this we can calculate why a rope sages in the middle"
bripi
One of the best parts of learning physics was learning that solving differenial equatiion didn't matter anymore since they'd already been solved. We happily just worked with the results.
jonnnney
The rockets are the easy part, the math is a bitch.
lezgetfukkinreal
Well it is rocket science—
Tarmaccian
It’s not really “hard” so much as it’s just “weird”…
You don’t drain fuel; you push it out.
You don’t go down to go lower; you go backwards.
You don’t speed up to go higher; you increase drag.
And just in case you need more energy, you can just steal some from a nearby rock.
There’s math for all that, and tools to assist… but mostly it’s just knowing that spaceflight is an unusual case for all the usual physics rules.
CBadger
You do speed up to go higher. Speeding up in any part of a non-hyperbolic orbit will increase the altitude of your apoapsis, periapsis, or both, depending on your position in the orbit. Not sure what you mean by increasing drag being linked to speeding up?
CBadger
"Speeding up" meaning specifically increasing your prograde velocity, to be clear.
Tarmaccian
So that one’s real fun, though I forget the exact timing details… It’s a cheap way for satellites to raise to a higher orbit.
Increasing drag (such as by angling solar panels) at the right time in the orbit changes eccentricity with a disproportionate change in kinetic energy. Periapsis lowers, but apoapsis raises, essentially for free.
With a small burn at periapsis, the Oberth effect magnifies the altitude gain, then a small burn at the following apoapsis circularizes again.
CBadger
Burning for oberth, then using aero forces to raise peri makes sense. I would imagine that would still lower your average altitude, if less so than the dip into a lower peri would. Definitely still a huge benefit to keep your craft out of thicker air without spending any fuel if reaction wheels can handle it.
testzero
oh come on, it's not brain surgery.
ElderLurkerInNeedOfaCane
Hahaha
MisterYukon
That is definitely not rocket surgery
xstickman
https://www.youtube.com/watch?v=THNPmhBl-8I
INeedMoreGifMeMoreJustOneMore
Mitchell and Webb, just as I suspected. Excellent bit.
mmontour
Kerbal Space Program will teach you 98% of what you need to know. Take a graduate degree program if you need that last 2%
Mmbear
Feel like they should have an elective in KSP for aerospace engineers.
CBadger
Pfft that last 2% is called "MechJeb", NASA should just use that. /s
barnwolf
The last 2% is done by a computer anyways.
Kerbal247
No joke. I literally did this. Played KSP. Loved it, went to grad school to finish up my masters degree in astronautics. I haven't used my degree for space stuff, but it was fun to master KSP!
swofromtherock
Part of me feels that Kerbal is harder than that last bit.