- ComradeSharkfucker ( @sharkfucker420@lemmy.ml ) English49•16 days ago
Also angles
Would love to hear how mass is measured in seconds though
- Kowowow ( @Kowowow@lemmy.ca ) English27•16 days ago
Angle: seconds
- uis ( @uis@lemm.ee ) English16•16 days ago
Mass in seconds? How? I get mass in Joules, but seconds?
- SaharaMaleikuhm ( @SaharaMaleikuhm@feddit.org ) English7•16 days ago
I measure the mass of my stool by seconds it takes to discharge
- Eiri ( @Eiri@lemmy.ca ) English5•16 days ago
There are two possibilities I can think of:
- Orbit duration can be used to calculate mass
- The diameter of a star or the parallax distance on the sky (in arcseconds) can also be used to evaluate mass
- Lifter ( @Lifter@discuss.tchncs.de ) English1•13 days ago
Size doesn’t say much about mass though.
- Eiri ( @Eiri@lemmy.ca ) English1•13 days ago
I thought stars of similar masses were also of similar sizes. They’re not?
- Lifter ( @Lifter@discuss.tchncs.de ) English1•12 days ago
I’m no astrologer but from what I’ve learned, we also need to look at the color to glassify stars into categories. It varies a bit though in each category so it’s a blunt tool.
Then there are other objects like gas clouds and even galaxies. For those, we have no idea of the density distribution, so radial size gives us even less info.
- Leate_Wonceslace ( @Leate_Wonceslace@lemmy.dbzer0.com ) English14•16 days ago
Wait, how do you measure mass in seconds?
- GiveMemes ( @GiveMemes@jlai.lu ) English8•16 days ago
- tiredofsametab ( @tiredofsametab@fedia.io ) 14•16 days ago
I’m hungry for more; may I have seconds?
- Sasha ( @Sasha@lemmy.blahaj.zone ) English12•16 days ago
As a theoretical physicist, units are for chumps
- qjkxbmwvz ( @qjkxbmwvz@startrek.website ) English6•16 days ago
It’s easy to remember c and ℏ if they’re both 1…
- Sasha ( @Sasha@lemmy.blahaj.zone ) English4•16 days ago
Constance? Never heard of her
- drail ( @drail@fedia.io ) 11•16 days ago
Everything should just be in eV. Particle physics natural units are the best.
- observantTrapezium ( @observantTrapezium@lemmy.ca ) English10•16 days ago
That may be relativists (they would actually measure anything in units of mass, with everything else defined through G = c = 1). Astrophysicists commonly measure mass in solar masses, long distances in parsec (or kiloparsec, megaparsec), short distances in solar radii or AU, and time in whatever is relevant to their problem (could be seconds or gigayears)
- FiskFisk33 ( @FiskFisk33@startrek.website ) English9•16 days ago
angle: seconds
- uis ( @uis@lemm.ee ) English4•16 days ago
Rads. But radians are fine too.
- frezik ( @frezik@midwest.social ) English4•16 days ago
Tau (τ). A full circle is just 1τ instead of 2π.
- HeuristicAlgorithm9 ( @HeurtisticAlgorithm9@feddit.uk ) English3•16 days ago
Yeah, but everything else is more annoying. 1+e^i(0.5τ)=0 just doesn’t hit the same
- frezik ( @frezik@midwest.social ) English1•16 days ago
Euler’s identity with tau simplifies to:
eiτ = 1
So it’s actually simpler. See: https://tauday.com/tau-manifesto#sec-euler_s_identity
- HeuristicAlgorithm9 ( @HeurtisticAlgorithm9@feddit.uk ) English1•6 days ago
Sure, it’s simpler; but it’s less elegant
- montechristo ( @montechristo@feddit.org ) English7•16 days ago
If you ever find yourself among theoretical physicists and/or astrophysicists and need a conversation starter, just ask about unit systems or unitless/natural measurement systems. There is no other profession that is more obsessed about that topic.
Just to put this here:
ħ=1
- umbrella ( @umbrella@lemmy.ml ) English6•16 days ago
all the same thing anyway
- m0darn ( @m0darn@lemmy.ca ) English5•16 days ago
Don’t they measure distance and time by redshift (ie colour)
- Generous1146 ( @Generous1146@beehaw.org ) English7•16 days ago
What even is color if not seconds^-1?
- m0darn ( @m0darn@lemmy.ca ) English1•15 days ago
Yeah true, but I think they actually use wavelength of red shift, which is distance… traveled by light in the time it takes to make a full cycle. So I guess we’re back to seconds again.
I think they use this for distance and time because at scales being dealt with they have the same implications.
- Allero ( @Allero@lemmy.today ) English2•16 days ago
They normally use parallax-seconds, i.e. parsecs, for long distance objects.
- m0darn ( @m0darn@lemmy.ca ) English2•15 days ago
I think you need to be more specific than ‘long distance’, yes they use parsecs for ‘long distances’ but I believe only for intra-galactic objects. I think other galaxies are too distant for parallax seconds to be useful.
- Allero ( @Allero@lemmy.today ) English1•15 days ago
Fair!
Thanks for this bit of clarification
- EarthShipTechIntern ( @EarthShipTechIntern@lemm.ee ) English5•16 days ago
Please Sir, can I have some more?
Lash him! Ridicule him! This boy wants seconds!
- 🇰 🌀 🇱 🇦 🇳 🇦 🇰 ℹ️ ( @Kolanaki@yiffit.net ) English4•15 days ago
I know some people that should measure their weight in mass per second.
- Hjalmar ( @Hjalamanger@feddit.nu ) English3•16 days ago
Can I get a conversation table?