What is the Hubble time? How old would the universe be if it were flat and there were no acceleration?
2006-07-05 00:03:34 · 3 answers · asked by pam k 1 in Science & Mathematics ➔ Astronomy & Space
H is just the speed divided by the distance, which reduces to the inverse of time, and T is just 1 / H, which is just time, so for your example:
H = 456 km/s / 8 Mpc
= 57 Mpc/km/s
To get the Hubble time T = 1 / H, first, I'll convert the 8 Mpc to km
8 Mpc = 8,000 pc
= 8,000 * 206,265 UA
= 8,000 * 206,265 * 149,598,000 km = ~2.5E17 km.
So if H = 456 km/s / 2.5E17 km/km/s
then the inverse of that, T, is just:
T = 2.5E17 / 456 = ~5.5E14 seconds
Dividing by 3,600 seconds in a hour, 24 hours in a day and 365.25 days in a year gives:
= ~417 million years.
You may want to check my arithmetic. But that is all it is, just elementary school arithmetic. No Einstein needed here.
2006-07-05 02:39:52 · answer #1 · answered by campbelp2002 7 · 1⤊ 1⤋
Sorry, can't answer this just now - I have to make lunch [ ;-) ]
A Einstein.
2006-07-05 00:09:51 · answer #2 · answered by prospero 2 · 0⤊ 0⤋
Pretty good arguments here.
2016-08-23 01:12:32 · answer #3 · answered by ? 4 · 0⤊ 0⤋