When Hubble first estimated the Hubble constant, galaxy distances were still very uncertain, and he got a valu

Question

When Hubble first estimated the Hubble constant, galaxy distances were still very uncertain, and he got a value for H of about 600 km/sec per Mpc.
What would this have implied about the age of the universe?
What problem would this have presented for cosmologists?

Answer 1

It all depends on how fast we think the universe expands. If the Hubble constant is large, the universe is expanding fast and it is young, too young to have some very old stars (10 byrs). The current best measurements are between 50-75 Km/s/mpc, which translates into an age of 12-13 billion years.

Answer 2

The Hubble constant is predicated on the assumption that the red shift is caused a recessional velocity.
The same effect would be the result of a galaxy collapsing,at an accelerated rate,towards the galactic center.
If you could view that galaxy from the other side the same red shift would be apparent.

Answer 3

It would mean the universe is relatively young. But some distant stars appear to be quite old so cosmologists would have two contradictory pieces of data for the age of the universe.