The Pod Bay

« first day (921 days earlier) ← previous day next day → last day (3316 days later) »

PearsonArtPhoto

00:04

I'm sure the same thing. I'm just curious if there's any even close...

duzzy

Did they also say that it would be on a very inclined plane? I imagine in most directions, that would be it very difficult to intersect.

Would that be the case?

PearsonArtPhoto

I suspect they imagine it to be roughly along the ecliptic plane, but I imagine there's a fairly wide range of inclinations that it could be based on the data.

duzzy

I've seen 30 degrees in a few places.

PearsonArtPhoto

Hmmm. Could be.

duzzy

00:22

Planet Nine

Planet Nine is a hypothetical large planet in the far outer Solar System, first proposed in 2014, which would explain the unusual orbital configuration of a group of trans-Neptunian objects (TNOs) whose orbits lie mostly beyond the Kuiper belt. The planet would have an estimated mass of around 10 Earths and an estimated radius of 13,000 to 26,000 km (8,100 to 16,000 mi) (approximately two to four Earths). On 20 January 2016, researchers Konstantin Batygin and Michael E. Brown at Caltech announced additional indirect evidence of Planet Nine based on a new scientific model of the orbits of several...

How do you guys do your fancy quote formatting? greater than?

> and its inclination estimated as 30 (± 20) degrees.

Woohoo!

Actually, this could be kind of fun to figure out.

I need a break from these Cisco videos.

I wonder if I can come close to finding anything. :P

PearsonArtPhoto

Go for it. I bet the question hits the supercollider, so it'd be a good way to gain some reputation.

3 hours later…

Space Exploration Meta

03:56

Q: What is the status of Space SE's beta rating?

What is the status Space SE's beta rating, as at January 2016, and when will we become a full site?

Space Exploration Meta

04:06

Q: Orbital dynamics or Celestial Mechanics symbol sets for Space SE

Are there any schematic symbol sets for celestial mechanics or orbital dynamics terms like periastron, perihilion, apogee, perigee, etc.for incorporation into ?MathJax for Space SE?

feature-request

duzzy

Welp... I think I'm in over my head.

8 hours later…

My Other Head

11:38

worldbuilding.stackexchange.com/questions/34100/… Can this question belong here or should I put it in Physics SE?

I've been told it doesn't belong in Worldbuilding SE.

Rory Alsop

12:01

How did I miss Scott's ama? :-(

reddit.com/r/IAmA/comments/42cllg/…

TildalWave

12:26

@MyOtherHead might go here but it doesn't make much sense to me, you won't be increasing surface gravity by increasing rotation, but decreasing it

i.e. you're increasing centrifugal acceleration but that points away from the focus, in the opposite vector to gravity

My Other Head

@TildalWave, thanks for clearing up my misconception.

TildalWave

otherwise it's a simple exercise of calculating angular momentum change

could be part of planetary-science, thrust and terraforming

so I guess it would belong here

one interesting thing is that depending on which direction you'd change angular momentum to, it might cause the Moon to move closer or farther from the Earth (slowly, as tidal torque works its magic)

but since the Moon is way above geosynchronous orbit, it would be much easier to move it farther away than closer

My Other Head

It's starting to come back to me. I should have revised the circular motion chapter in my Halliday & Resnick, before I posted. But one thing I do remember from 35 years ago is my lecturer saying (in a Scottish brogue) "There ain't no such animal as centrifugal motion - there is only centripetal!!!". :-)

TildalWave

12:48

wrong, and this is so often explained wrong it's almost upsetting

centrifugal force is real, but it only applies in a rotating frame of reference

that's why it's sometimes referred to as a fictitious force

but that doesn't mean it doesn't exist, that's just a common misinterpretation of what that means in physics

in layman terms, you'll feel it while your motion is being affected by the circular motion of the body you hold onto, but as soon as you let go that force doesn't exist for you any more

it basically boils down to difference in speed and velocity in uniform circular motion

velocity as a vector quantity changes because its direction changes, speed as a scalar quantity remains the same... and if a body of non-zero rest-mass is a subject to velocity change, you get a force

My Other Head

I will reread that chapter and others. I've gotten too many misconceptions of statics and dynamics over the years, though my electricity/magnetism/light is fairly current. Makes sense to do that /before/ I start on studying BMW.

TildalWave

TL;DR when you're driving on a roundabout, you're not imagining the force pushing you outward of the roundabout center

My Other Head

13:05

yes. What does TL;DR stand for?

TildalWave

too long; didn't read :))

My Other Head

what's your time zone? I'm AESuT

TildalWave

CET, it's now UTC+1h

or is it CEST

what is AESuT?

Oz?

My Other Head

Australian Eastern Summer Time

TildalWave

gotcha, so Sydney and such... NSW/Tasmania/Queensland,...

geez it's past 11 pm there

2 pm here

My Other Head

13:11

Yes, eastern states except Queensland - Qld doesn't have daylight saving. not sure if AESuT is an official designation.

Are there 24-hour wall clocks in Europe or US?

TildalWave

13:30

only as novelty items, I haven't seen many

12 hour dials are most common

3 hours later…

duzzy

16:55

I've never seen a 24-hour wall clock before.

TildalWave

Maybe digital ones were meant that can switch between 24h and 12h am/pm display?

for dial ones I think that 24h ones are awful... mostly because 60 mod 24 != 0

also, if someone shouts at you to check out your 6 o'clock, do you turn by 180° or by 90° then?

duzzy

17:17

@TildalWave lol a very strong point.

5 hours later…

kim holder

22:26

Hohmannfan

Revolution?

TildalWave

noooooo omg that's awful

kim holder

@duzzy i once used to go to an office that used a wall clock like this. i didn't notice until one day i was having an argument about the timing of something and went to reference the time to support some central point i was trying to make.

it's decimal time, from the french revolution.

TildalWave

I'm gonna pretend that's a pressure gauge

le pressure gauge then

kim holder

@Hohmannfan hey, you know it :]

duzzy

22:29

@TildalWave lol

That clock is crazy.

kim holder

not only that it isn't even a standard decimal clock face.

Hohmannfan

kim holder

that's a standard decimal clock face. i think...

Hohmannfan

binary time!

kim holder

LOL :D

TildalWave

22:34

no solid state time?

time ... is

Hohmannfan

Solid state? Like this?

TildalWave

yes

like, someone asks you what the time is and you say "yes" :D

Hohmannfan

What if you say "no"?

duzzy

lol that's awesome

kim holder

TildalWave

22:37

oh hey that's a lovely freehand circle!

kim holder

:DDD

Hohmannfan

My freehand circles are crappy by intention

duzzy

circle hipster.

Hohmannfan

Ah, the good old times where it was not that important with accurate circles, and pi was just 3

TildalWave

@duzzy Circle hipster? That's like an euphemism for rolling one's own?

kim holder

22:39

i propose we make the number three exactly equal to pi, to simplify trigonometry.

Hohmannfan

pigonometry

duzzy

@TildalWave lol it was not meant to be, but undoubtedly it could mean that.

Hohmannfan

@kimholder A representation of a regular piangle in pigonometry:

kim holder

:DDD

Hohmannfan

lovely angles of $\pi - 2$ radians

No mathjax?

$\frac{Math}{is}_{broken!}$

kim holder

22:45

do you have david's mathjax extension?

TildalWave

@Hohmannfan chrome.google.com/webstore/detail/se-chat-mathjax/…

Hohmannfan

@TildalWave Fox?

TildalWave

@Hohmannfan github.com/dvdfreitag/SE-Chat-MathJax

you can ~~make~~ roll your own ;)

or use MathML addons.mozilla.org/en-US/firefox/addon/mathjax-native-mathml

yeah, that one doesn't actually work, I just tried

Hohmannfan

@TildalWave Same here :(

TildalWave

it does make MathJax on the site look a bit different tho

Hohmannfan

22:51

But hey! It was amazing when mosaic added PICTURES to browsing, so why complain?

Yeah.. the add on makes the math look terrible. With the extension:

without:

TildalWave

that's not too bad, but search for "mhchem" on the site and embrace the awful LOL

Hohmannfan

23:15

Nobody else thinking that "NASA Small Bodies Assessment Group" sounds weird?

TildalWave

23:46

it's just you

:))

oh shoot I missed the space show tonight

anyone listened to it?

Feeds

TildalWave has added an event to this room's schedule.

TildalWave

^ (tomorrow, The Space Show w/ co-host Tom Marotta and guests Charles Miller and Joshua Jenkins, more info: thespaceshow.com/newsletter, podcast: thespaceshow.com/content/listen-live)

Feeds

TildalWave has added an event to this room's schedule.

TildalWave

^ (on 26th/27th, The Space Show w/ Loretta Hall re her book "The Complete Space Buff's Bucket List", same links as above)

Feeds

TildalWave has added an event to this room's schedule.

TildalWave

23:58

^ (on 29th, The Space Show w/ Frank Wwhite & Steve Rotfeld re The Overview Effect, same links as above)

« first day (921 days earlier) ← previous day next day → last day (3316 days later) »

all rooms