Quote:
Originally Posted by davidgow77  Hi folks.... I wonder if anyone can help me.
I want to find out if there is a relationship between the amount of energy in the observable universe (including dark matter and dark energy), and the amout of space in the observable universe. Does anyone know how to calculate these values?
Also, can anyone tell me what the current rate of expansion, along with it's rate of acceleration???
Afew questions there, but any help would be greatly appreciated.
dg77  |
Thanks davidgow77 for asking a question I've often wondered about.
From Wikipedia, the
radius of the observable universe is about 46 billion light years.
So, the volume of the observable universe is
\frac{4}{3} \times \pi \times \mathrm{R}^3 = 4 \times 10^{32}\text{ ly}^3
with R = 46 billion light years according to Wikipedia and my own calculations.
The same Wikipedia article estimates the visible mass in that volume as
9 \times 10^{21} \ \textrm{solar masses}
or about
1.8 \times 10^{52}\ \textrm{kg} if one solar mass = 2 \times 10^{30}\ \textrm{kg}
Since visible matter is less than 5% of the total matter in the universe, I guess the total is
3.6 \times 10^{53}\ \textrm{kg}
or more.
Wikipedia gave me the
dark matter estimate as 22% and the dark energy as 74%
No doubt you have much better answers by now, but this has been a good exercise for me. I suspect I have a bit to learn regarding this editor and how it handles tags.
Thanks