# What unit of measure does the Hubble constant use?

Apr 24, 2016

km/s/megaparsec

#### Explanation:

As of now, based on advanced technological methods in

measurements, the Hubble constant in the formula,

Recession speed = ${H}_{o}$ X distance,

${H}_{o}$= 68 km/s/parsec, a little less than earlier estimates around 70. .

This means that a galaxy is relatively receding at a rate 68 km/sec

per the spacing of 1 parsec.

For N parsecs the recession speed = N km/s.

Here, 1 megaparsec = 1 million parsec and 1 parsec = 206265 AU =

30857 billion km.

So, 1 megaparsec = 30857 million billion km = 3 X ${10}^{19}$ km, nearly.. .