this post was submitted on 02 Nov 2023
164 points (98.8% liked)
Asklemmy
44151 readers
1667 users here now
A loosely moderated place to ask open-ended questions
Search asklemmy π
If your post meets the following criteria, it's welcome here!
- Open-ended question
- Not offensive: at this point, we do not have the bandwidth to moderate overtly political discussions. Assume best intent and be excellent to each other.
- Not regarding using or support for Lemmy: context, see the list of support communities and tools for finding communities below
- Not ad nauseam inducing: please make sure it is a question that would be new to most members
- An actual topic of discussion
Looking for support?
Looking for a community?
- Lemmyverse: community search
- sub.rehab: maps old subreddits to fediverse options, marks official as such
- [email protected]: a community for finding communities
~Icon~ ~by~ ~@Double_[email protected]~
founded 5 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
Have no idea how this works... there is no gravitational pull at the L2 point, it's just an empty point in space π€¨.
You're tell me bro. I need to research this more.
Maybe gravitational push-pull between planets and moons... IDK, it might be some sweet spot they discovered where gravitational forces do weird things, lol π.
This. There's 5 Legrange Points for every 2 body system. They're specific points around the 2 bodys where the gravity "cancels out". In this case the 2 body system is the Earth and the Sun. JWST is sitting a million miles from Earth at L2.
Dammit, I was feeling proud that my first thought on how this could work lined up with the explanation... But I had assumed L2 (didn't stop to think about the label) was where I now see L1 to be. I can wrap my head around L1 just fine, but how the heck is L2 the same? Or the others for that matter? Gonna stare at this for a while...
If you understand gravity wells, think of L1/L2/L3 as the shape of a saddle. If you're right in the middle of the saddle it's a pretty stable orbit, but if you get too close to any of the edges you fall right out of it. L4 and L5 are like the peaks of a mountain.
Also worth pointing out that only L4 and L5 are stable, L1/L2/L3 are only metastable where they require a bit of maintenance to stay there.
Another fun fact about Legrange Points: There's a group of asteroids called the Trojan Asteroids. There's technically two groups of these since they're stuck in L4 and L5 in the Sun/Jupiter system.
Ah, so that's why we don't put shit in L4 and 5 π... things will bump in them once in a while π.