this post was submitted on 24 Jul 2024
208 points (95.2% liked)
Star Wars Memes
11460 readers
109 users here now
Hello there. Somehow, Star Wars memes have returned. It's not a trap, this is where the fun begins.
Technical note: if you're coming from another star system and are getting a "Subscription pending" message when trying to dock, that's just the console being slow to display the right message. The connection is already established. (Probably.)
==========
IMPORTANT
Do not post the "good friend" or similar copypasta
==========
Special days!
Friday and weekends: Caption contest. An image will be pinned, and we shall make captions for it and post them in the comments.
Wednesday: Theme day. We have Droids day, EU day, poem day, aliens day... Let the pinned post guide you. Memes with the theme are preferred.
==========
Other universes to visit:
Separatist systems:
Oh hey some real SW content for a change (perhaps):
!starwarstelevision@lemmy.world
==========
Our galactic citizens have requested more specific rules, so here are a few.
The general idea is, if you're looking here for rules, you're probably someone who doesn't need to have them spelled out. You're fine. But anyway:
-
This is a community for Star Wars memes. This means typically screenshots of Star Wars media with some text or context that's meant to be funny and/or thoughtful. All SW media is welcome: movies, games, comic books, fanart... Other kinds of content, like video links or meta memes (about this community, or Lemmy), are fine as well, just keep it on topic.
-
We are all friends here, and love (sometimes love to hate) Star Wars. Be nice to each other.
-
As fans of fictional media, we can be passionate. If you very strongly disagree with something or someone, take a deep breath before reacting. Anger leads to the dark side!
-
Everything in Star Wars has happened a long time ago, in a galaxy far away, and it's a rich universe of millions of words and millions of years of history. So current Earthly matters really shouldn't concern us here. In other words, leave politics, philosophies and convictions behind the door. This applies even if it's about something related to Star Wars.
-
Original content is preferred. Reposts are fine, just please limit to a maximum of 3 per day, per citizen. It is recommended, but not required, to mark original memes as (OC) and reposts as (repost).
-
Local mods are the Jedi council. They may take actions that are necessary to maintain peace and stability of the Republic, even beyond the rules outlined here. Follow their guidance.
-
Regular rules of the Lemmy.world instance apply.
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
I'm curious if it would be similar to that of the moon, less than, or moreso.
It is made entirely of metal which is super dense and has a lot of mass, but a lot of it is also open space I imagine. Curious if the smaller amount of dense metal would have a larger or smaller mass than a solid moon.
Wait. I just realized energy also creates a gravitational pull, and the death star’s whole thing is destroying a planet right? That’s got to take a huuuge amount of energy because the explosion has to massively overcome the gravity holding the target together.
A quick google search says you'd need 10^32 Joules to blow up the earth. E=mc2 so dividing that energy by the speed of light squared gives about 1.1e15 kg of equivalent mass which is relatively small compared to earths mass (6e24) but still large.
For reference, if the radius of the Death Star was 1000m you’d get about 5.2m/s2 acceleration from just that energy in its core.
But if the Death Star is able to blow up multiple planets, then the energy it has to have on hand goes up. So if the Death Star contains enough energy to blow up 5.4 billion planets, then just that stored energy would have nearly equivalent “mass” to the earth.
But gravitational acceleration is inversely proportional to distance squared. So since the Death Star is small, you wouldn’t need that much energy to get earth gravity. If we assume the Death Star has about a 160km radius, then you’d only need enough stored energy to blow up ~45,000 earths to get a surface gravity of 9.1m/s2.
This gravity would increase as you got closer to the core or whatever part stores all that energy. But if you spread that energy out a bit you could probably extend how large the earth-like gravity range in the station would be.
The mass of the structure itself would contribute to the gravity too so that 45,000 is probably an overestimate.
TL;DR: From rough math in my head, assuming a radius of 160km, point mass, and ignoring the mass of the structure, you’d only need to store ~5e19 J of energy in the Death Star to get earth like gravity on the surface. That is approximately the amount of energy required to blow up 45,000 earths
Do you have a citation that energy has a gravitational pull?
General Relativity
As I understand it, gravity arises from the curvature of spacetime which is described by the Stress-Energy Tensor which only accounts for energy and momentum in a given part of spacetime.
So, really it’s like energy is actually what causes gravity in the first place, not mass. Massive things have large gravitational pull because mass itself has/is energy, E = mc^2^. This energy and its motion curves space and gravity results from that curvature.
Then again, I’m an engineering student not a physicist, so maybe I’ve got something wrong.
That's pretty fascinating.