# Is the 74.2km/sec per megaparsec accidental? [duplicate]

The rate of expansion of the universe is 74.2km/sec per megaparsec

The age of the universe is 13.798 bln years

That places the furthest theoretically observable edge of universe at 13.798 bln light years away - this is how long light would take to reach us from there, and there were no light sources before that date.

Now, how fast does the observable part of the universe expand? A bit of unit conversion and multiplication:

13798000000 light years in megaparsecs = 4 230.39567 megaParsecs [1]

74.2km/sec in light years/year = 0.000247504559 light years / year [2]

Multiply the two, and I get the expansion rate:

1.04704221 light years per year per distance to the observable edge of the universe.

Speed of 1 light year per year is the speed of light. The 0.047 seems awfully small. Probably within error margin of the universe expansion speed and age of the universe estimates.

Is this a coincidence, or is this somehow bound - and if so, what are the consequences?

• possible duplicate of Hubble time, the age of the Universe and expansion rate Oct 24 '13 at 15:38
• "That places the furthest theoretically observable edge of universe at 13.798 bln light years away" Makes sense in a naive way, but not so. Part of the travel occurred when space was smaller than it is now. Oct 24 '13 at 15:47