this post was submitted on 20 Mar 2024
487 points (98.2% liked)

xkcd

9081 readers
200 users here now

A community for a webcomic of romance, sarcasm, math, and language.

founded 2 years ago
MODERATORS
 

https://xkcd.com/2909

Alt text:

If you pick a low enough orbit, it gives you a lot of freedom to use a lightweight launch vehicle such as a stepladder.

top 30 comments
sorted by: hot top controversial new old
[–] LazaroFilm@lemmy.world 35 points 10 months ago (1 children)

For option 4, they could have used a rope and just pulled it closer.

[–] Kolanaki@yiffit.net 32 points 10 months ago (1 children)
[–] topinambour_rex@lemmy.world 7 points 10 months ago

I love how they describe the impact it has, the day after in the news.

[–] psud@aussie.zone 34 points 10 months ago (1 children)

The current Artemis 4 plan

Gateway

  • Two modules launched together to lunar near rectilinear halo orbit (NHRO)

Lander

  1. Starship lander launches to LEO
  2. Some large number of starship tankers (or few tankers doing many flights) refuel the lander
  3. Lander flies to NRHO, docks with gateway

Transport

  1. Crew launch and fly to NHRO in Orion
  2. Orion rendezvous with gateway
  3. Crew land using the lander, do stuff
  4. Crew ascend to NHRO in lander
  5. Lander rendezvous with gateway
  6. Crew return to Earth in Orion
[–] echodot@feddit.uk 2 points 10 months ago* (last edited 10 months ago) (1 children)

But I think Artemis 3 is slated to be the first human mission to the moon that actually lands, and that will be pre gateway station so presumably they don't actually need the space station presumably they can just dock directly to the lander which makes you wonder why they're even building the station.

The plan has come under a fair amount of criticism for being overly complicated while at the same time not really having any extra operational capacitys over Apollo. Mostly this seems to be a cluge for the fact that starship (the lander is basically just starship with mods) isn't human rated and obviously NASA has no information on the timeline as to when that will happen, assuming it happens at all. Combined with the fact that Congress insisted that NASA reuse the shuttle engines presumably because they mistakenly assumed that would save money or something. So now they need to build a launcher.

Oh, and they only have enough shuttle engines for three or four SLS rockets anyway so the whole thing isn't even particularly long lived.

The whole plan is just weird.

[–] psud@aussie.zone 1 points 10 months ago

Yeah, I think when they decided they needed gateway station they thought they would be using a much smaller lander

[–] Hamartiogonic@sopuli.xyz 20 points 10 months ago* (last edited 9 months ago) (4 children)

If you pull the Moon closer to the Earth, gravity will begin to disintegrate it and shred it into kwazillion asteroids that eventually become meteors which will bombard the Earth back to the lava age. Once that is done, the moon doesn’t exist and there’s no need to go to the moon ever again. Problem solved.

[–] BestBouclettes@jlai.lu 12 points 10 months ago (1 children)

50 billion birds with one stone kinda solution

[–] Hamartiogonic@sopuli.xyz 3 points 10 months ago

LOL. Just need a bigger stone.

[–] Shialac@lemmy.world 4 points 10 months ago

just build a stronger moon

[–] Agent641@lemmy.world 3 points 10 months ago

Theres a book about that called seveneves

[–] e_t_@kbin.pithyphrase.net 20 points 10 months ago (1 children)

Simple! Just change the gravitational constant of the universe.

[–] Kinglink@lemmy.world 20 points 10 months ago

IF no one has thought of it, has it really been rejected?

[–] randomaccount43543@lemmy.world 19 points 10 months ago (1 children)
[–] towerful@programming.dev 18 points 10 months ago

it only depicts the means to reach the Moon, more suitable for robotic missions that are not required to return,^[racist comment implying that robots have no right to be repatriated]^

[–] Kolanaki@yiffit.net 9 points 10 months ago

Makes sense to me. Just move the moon closer. 🤷🏻‍♂️

[–] dejected_warp_core@lemmy.world 9 points 10 months ago (2 children)

Option #4 - This reads like Mr. Munroe is setting things up for another entertaining article/video/book topic.

The energies required to move the moon closer to the Earth would be staggering. Then there's the gravitational impact to consider, and how fast it would need to be moving to keep a stable low-earth orbit; assuming that's what we're aiming for as a rendezvous. My guess is that, combined, this is close and fast enough to create mile-high tsunamis every day (maybe even all day), all over the planet. Meanwhile, our astronauts would be on the lunar surface watching the destruction from safety.

[–] Magnetar@feddit.de 5 points 10 months ago (1 children)

You should watch the cinematic masterpiece "Moonfall".

[–] UnrepententProcrastinator@lemmy.ca 4 points 10 months ago

Really shows how the Oscars are corrupt when faced with the fact that this movie didn't make the cut.

[–] anton@lemmy.blahaj.zone 4 points 10 months ago (1 children)

The tidal forces would probably tear apart the moon into rings, the best place to watch would be a higher orbit.

[–] dejected_warp_core@lemmy.world 1 points 10 months ago

Good call. There's a good Joe Scott video on what that would look like, IIRC.

[–] Wanderer@lemm.ee 8 points 10 months ago (1 children)

Because the main goal was to beat the Russians to the moon. They also came up with a plan to fly astronauts to the moon then later devise a way to get them back.

[–] dejected_warp_core@lemmy.world 1 points 10 months ago

I heard they would have needed a bigger rocket for that, in order to account for giant clanking brass ones adding to the launch weight.

[–] OpenStars@startrek.website 4 points 10 months ago (1 children)

That's not "fair"! Such an unbalanced relationship.

[–] towerful@programming.dev 1 points 10 months ago* (last edited 10 months ago)

Damnit, wrong comment

[–] Amaltheamannen@lemmy.ml 3 points 10 months ago

Ive always preferred the idea of putting tugs with nuclear thermal rockers in orbit and using them to ferry things through cislunar space.

[–] mozz@mbin.grits.dev 3 points 10 months ago

"Potentially taking longer"

[–] PhlubbaDubba@lemm.ee 1 points 10 months ago

"Have your people talk to my people."

"...but I don't have any..."

"Well then go get some!"