Search the FAQ Archives

3 - A - B - C - D - E - F - G - H - I - J - K - L - M
N - O - P - Q - R - S - T - U - V - W - X - Y - Z
faqs.org - Internet FAQ Archives

[sci.astro] Cosmology (Astronomy Frequently Asked Questions) (9/9)
Section - I.12. How can the Universe be infinite if it was all concentrated into a point at the Big Bang?

( Part0 - Part1 - Part2 - Part3 - Part4 - Part5 - Part6 - Part7 - Part8 - Single Page )
[ Usenet FAQs | Web FAQs | Documents | RFC Index | Cities ]


Top Document: [sci.astro] Cosmology (Astronomy Frequently Asked Questions) (9/9)
Previous Document: I.11. Are galaxies really moving away from us or is space-time just expanding?
Next Document: I.13. Why haven't the CMB photons outrun the galaxies in the Big Bang?
See reader questions & answers on this topic! - Help others by sharing your knowledge

Only the *observable* Universe was concentrated into a point at the
time of the Big Bang, not the entire Universe.  The distinction
between the whole Universe and the part of it that we can see is
important.

We can see out into the Universe roughly a distance c*t, where c is
the speed of light and t is the age of the Universe.  Clearly, as t
becomes smaller and smaller (going backward in time toward the Big
Bang), the distance to which we can see becomes smaller and smaller.
This places no constraint on the size of the entire Universe, though.

User Contributions:

Comment about this article, ask questions, or add new information about this topic:

CAPTCHA