On Mar 24 , at 1:15 AM, Pat Naughtin wrote:
I want to write:
'The Universe is approximately 285 yottametres in diameter.'
Is this correct?
There probably IS NO firmly established measurement of estimate of
that distance. I googled diameter of the universe and found several
useful sites. One was this one (below) which I'd suggest starting
with, It contains 12 different estimates of the size of the universe,
all reduced to a value in billions of light years for ease of
comparison.
The site is:
http://hypertextbook.com/facts/2002/CarmenBissessar.shtml
It gives most values of 20 to 30 billion light years, but some are
considerably larger and a few smaller. Using the 20 to 30 billion l.y.
figures I get the following:
A light year (l.y.) is 9.46 x 10^15 m.
(Ref. Any decent physics text book like the one in front of me).)
20 billion l.y. is equal to 20 x 10^9 l.y. which,
by multiplying the above two figures, gives us
(20 x 10^9 l.y.) x (9.46 x 10^15 m/l.y.) or
20 billion l.y. = 190 x 10^24 m
or, finally:
20 billion l.y. = 190 Ym
Similarly, 30 billion l.y. = 280 Ym
I hope this gives you an answer you can use. Just be aware that it is
really unknown and all such sizes are estimates based on some widely
different criteria.
Regards,
Bill Hooper
Fernandina Beach, Florida, USA
==========================
SImplification Begins With SI.
==========================
