# Thread: Calculations of the Width of the Universe Based on Hubble C.

1. ## Calculations of the Width of the Universe Based on Hubble C.

Calculations of the Width of the Universe Based on Hubble C.

I did a quick spreadsheet of a distance an object travels at Hubble Constant for a period of 13.7 years. Hubble Constant is an acceleration number, meaning it increases with time. Best estimate is around 50 to 100 Km/Sec for every Mpc. One Mpc
= 1,000,1000 Pc, one Pc = 3.26 light years of traveling.

I used for now 50 Km/Sec Mpc. I had 4,205 spreadsheet entries, or the speed doubled 4,205 times to reach 13.7 billion years. The speed of the object increases with time. I used the speed as a percentage of the light speed then calculated the distance in Billions of Light Years.
Assuming galaxies accelerating through the universe from the time of the Bing Bang (13.7 Billion years ago) at an accelerating Rate of 50 Km/Sec/Mpc, then the universe or the farthest galaxy (Last Column) traveling in space at any given time (first Column), see below:

Billions of Years Speed of Moving Galaxies in Km/Sec Speed in Light speed Distance in Billions of light yrs
0.00326 50 0.00016666 5.43333E-07
1.00082 15350 0.051166667 0.051208623
2.01794 30950 0.103166667 0.208184143
5.00084 76700 0.255666667 1.278548093
13.7083 210250 0.700833333 9.607233583

That means the universe is 9.6 billion light years in width, however, if Hublle Constant is 100 Km/Sec/Mpc then that number could be 20 billion light years. I have see some estimate as high as 500 Km/Sec/Mpc.

John Farage
Casual Observer 2. ## Oh, forgot to mention, that number one before last 0.700833333 is the current speed of traveling in light speed percentage. It means we are racing in space at 0.7 of the light speed. 3. ## If I'm not mistaken I read not too long ago that the observable universe is believed to be some 15 billion parsecs (a parsec is almost 3.3 LY)...some 45 billion LY. 4. ## This is pure mathematical spreadsheet based on one number. Hubble Constant is not cast in iron. The way I look at it as if you have a laser speed detector and shooting at one moving star and determine the distance from the Redshift calculation of the distance and come back again sometimes in the future and do the same., by doing that like three times on equal time intervals, then you can come up with speed and acceleration. Thats why the number varies widely. Some says its 160 Km/Sec/Mpc. If thats the case then its around 30 BLY.

Joe Lalumia sent me this link
The Universe is 156 BLY
SPACE.com -- Universe Measured: We're 156 Billion Light-years Wide! 5. ## The Following User Says Thank You to John W. Farage For This Useful Post:

cawilliams1983 (12-04-2010)

6. ## Way to get in there and play with the numbers, John! Thanks. 7. ## That's how I require information: someone else needs to crunch the numbers! But we all enjoy the results...thanks, John!

If I would've done the calculations, 2 + 2 would equal CAT.  based, calculations, hubble, universe, width 