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Hubble's Law

On the June 2014 OCR G485 paper, Paper- http://www.ocr.org.uk/Images/243747-question-paper-unit-g485-01-fields-particles-and-frontiers-of-physics.pdfFor question 9e why couldn't you say ‘Sirius / star is moving towards us' because I thought Hubble's Law applies to receding galaxies (ok the star is not in a distant galxy but if it was then what?).Answers- http://www.ocr.org.uk/Images/236085-mark-scheme-unit-g485-fields-particles-and-frontiers-of-physics-june.pdf

Reply 1

Joinedup

Original post by runny4

Well Hubbles law only applies to distant galaxies is about right for a 1 mark question... you might additionally say something about gravitational binding I suppose.

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Sirius appears as a very bright naked eye star from Earth

discovering Hubbles law required a leap in telescope technology (especially apeture size) in the early 20th century because it required collecting spectra from such distant objects. These galaxies aren't just a little bit further away than naked eye stuff.