Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://www.astronomy.com/News-Observing/Ask%20Astro/2012/09/The%20infinite%20cosmos.aspx
Äàòà èçìåíåíèÿ: Unknown
Äàòà èíäåêñèðîâàíèÿ: Sun Apr 10 12:23:19 2016
Êîäèðîâêà: ISO8859-5

Ïîèñêîâûå ñëîâà: ï ï ï ï ï ï ï ï ï ï ï ï ï ï
How is it possible for the universe to be infinite if it had a beginning, 13.7 billion years ago by most estimates? | Astronomy.com
Tonight's Sky
Sun
ò??
ò??
Sun
Moon
ò??
ò??
Moon
ò??
ò??
Mercury
ò??
ò??
Mercury
ò??
Venus
ò??
ò??
Venus
ò??
Mars
ò??
ò??
Mars
ò??
Jupiter
ò??
ò??
Jupiter
ò??
Saturn
ò??
ò??
Saturn
ò??

Tonight's Sky ò?? Change location

OR

Searching...

Tonight's Sky ò?? Select location

Tonight's Sky ò?? Enter coordinates

ÒÀ '
ÒÀ '

How is it possible for the universe to be infinite if it had a beginning, 13.7 billion years ago by most estimates?

Wally Davis, Dayton, Ohio
Cosmos
The biggest point of confusion in this question is the assumption that in 13.7 billion years the universe could have grown by only 13.7 billion light-years. This assumption is false. When we talk about the universe being a certain age, we mean that the proper time measured by a clock moving with cosmic expansion reads that many years since the Big Bang. If we use coordinates based on Albert Einsteinò??s special theory of relativity, that assumed clock moving with expansion travels close to the speed of light and thus hardly ticks at all. Thus, the universe can get huge before clocks have measured 13.7 billion years.

Astronomy magazine subscribers can read the full answer for free. Just make sure you're registered with the website.

Already a subscriber? Register now!

Registration is FREE and takes only a few seconds to complete. If you are already registered on Astronomy.com, please log in below.
ADVERTISEMENT

FREE EMAIL NEWSLETTER

Receive news, sky-event information, observing tips, and more from Astronomy's weekly email newsletter.

ADVERTISEMENT
ADVERTISEMENT
asy_gravitational_eguide

Click here to receive a FREE e-Guide exclusively from Astronomy magazine.

Find us on Facebook