Comment on Seconds

uis@lemm.ee ⁨11⁩ ⁨months⁩ ago

• Eiri@lemmy.ca ⁨11⁩ ⁨months⁩ ago

  There are two possibilities:

  • 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

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  • Lifter@discuss.tchncs.de ⁨11⁩ ⁨months⁩ ago

    Size doesn’t say much about mass though.

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    • Eiri@lemmy.ca ⁨11⁩ ⁨months⁩ ago

      I thought stars of similar masses were also of similar sizes. They’re not?

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      • Lifter@discuss.tchncs.de ⁨11⁩ ⁨months⁩ 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.

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• SaharaMaleikuhm@feddit.org ⁨11⁩ ⁨months⁩ ago

  I measure the mass of my stool by seconds it takes to discharge

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• HereIAm@lemmy.world ⁨11⁩ ⁨months⁩ ago

  Well the modern definition of a kg is based off of the second and the metre en.m.wikipedia.org/wiki/Kilogram :P

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• Gonzako@lemmy.world ⁨11⁩ ⁨months⁩ ago

  The amount of time a mass M attracts a unitary sphere up into CoM.

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