In endless UNIVERSE [Steinhardt & Turok; a Christmas present so don't blame me ] I read: "...the WMAP image painted on the outer layer appears to span an enormous area, a spherical surface 13.7 billion light-years in radius." [p.27]
The APOD explanation under the picture has the same number.
What I cannot understand are:
--1-- How did "we" [the mass comprising our galaxy and us] ever get in a position out in front of those light rays so that "we" are intercepting them now, if the universe is only about 14 billion years old?
How far and, most critically, fast have "we" travelled in that time?
--2-- Even more curiously, how can "we" be at the center of a sphere with a 13.7 billion light-year radius?
That puts opposite sides 27.4 billion light-years apart.
To my mind, there is a logical error in here somewhere.
Peace,
Phil [NOT a physics student] G
PS: where can I discuss other matters in their book, especially "vacuum energy" [p.43]?
WMAP 25 Sep 2005 (and before)
WMAP Resolves the Universe (APOD 2005 Sep 15)
Universe Measured: We're 156 Billion Light-years Wide! (Space.com 2004 May 24)
You can discuss vacuum energy and almost anything related to cosmology in The Asterisk Cafe.
Universe Measured: We're 156 Billion Light-years Wide! (Space.com 2004 May 24)
You can discuss vacuum energy and almost anything related to cosmology in The Asterisk Cafe.
Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk. — Garrison Keillor
alive to the gentle breeze of communication, and please stop being such a jerk. — Garrison Keillor