Figure 1 from Hubble 1929 (original paper with open access pdf) has velocity with units of km. Is this just a typo or was there a reason the plot is printed this way?

enter image description here

  • 2
    $\begingroup$ The paper indicates that it should be km/s. Maybe the creator of the graph was not awake when it was made. $\endgroup$
    – LDC3
    Aug 17 '14 at 2:15

It is in fact supposed to be in $\mathrm{\frac{km}{s}}$ (KILOMETRES per second).

I think that whoever authored the paper, probably took it as a random shortcut and assumed anyone reading it would either have read the paper and understand it is supposed to be $\mathrm{\frac{km}{s}}$, or just assume it from the fact it says velocity.

  • $\begingroup$ This can also be confirmed by the single cross mark in Figure 1 at the location described by the sentence "The result, 745 km./sec. for a distance of 1.4 x 10[6] parsecs..." $\endgroup$
    – uhoh
    Dec 31 '17 at 8:45

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.