There is considerable debate about the exact value of the Hubble constant.?

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KING

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Hi, I am a bit stuck on some Physics work. I would really appreciate it if anyone could help me out.

Regards

1) Describe one method of finding an accurate value of the Hubble constant.
2) Kirsty calculated that a galaxy 1.3 x 10(Superscript 20) km away will have a recession speed of 286km/s. What value of the Hubble constant did she use in her calculation?
Choices:
2.0 x 10 (Superscript -18) s (Superscript -1)
2.2 x 10 (Superscript -18) s (Superscript -1)
3.0 x 10 (Superscript -18) s (Superscript -1)
2.8 x 10 (Superscript -18) s (Superscript -1)
2.6 x 10 (Superscript -18) s (Superscript -1)
 
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