Comment on Seconds

m0darn@lemmy.ca ⁨9⁩ ⁨months⁩ ago

• Generous1146@beehaw.org ⁨9⁩ ⁨months⁩ ago

  What even is color if not seconds^-1?

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  • m0darn@lemmy.ca ⁨9⁩ ⁨months⁩ 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.

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• Allero@lemmy.today ⁨9⁩ ⁨months⁩ ago

  They normally use parallax-seconds, i.e. parsecs, for long distance objects.

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  • m0darn@lemmy.ca ⁨9⁩ ⁨months⁩ 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.

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    • Allero@lemmy.today ⁨9⁩ ⁨months⁩ ago

      Fair!

      Thanks for this bit of clarification

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