Editing Meaning of life (section)

===Origins and ultimate fate of the universe===
[[File:CMB Timeline300 no WMAP.jpg|thumb|upright=1.6|Modern view of the [[expansion of space]]. The [[inflationary epoch]] is a period of rapidly accelerating expansion at left.]]

Though the [[Big Bang]] theory was met with much skepticism when first introduced, it has become well-supported by several independent observations.<ref>{{Cite book |author=Helge Kragh |title=Cosmology and Controversy |publisher=Princeton University Press |date=1996 |isbn=978-0-691-00546-1 |url=https://archive.org/details/cosmologycontrov00helg }}</ref> However, current physics can only describe the early universe from around 10<sup>−43</sup> seconds after the Big Bang (where zero time corresponds to infinite temperature); a theory of [[quantum gravity]] would be required to understand events before that time. Nevertheless, many physicists have speculated about what would have preceded this limit, and how the universe came into being.<ref name="Prantzos & Lyle">{{Cite book |author1=Nikos Prantzos |author2=Stephen Lyle |title= Our Cosmic Future: Humanity's Fate in the Universe |publisher=Cambridge University Press |date=2000 |isbn=978-0-521-77098-9}}</ref> For example, one interpretation is that the Big Bang occurred coincidentally, and when considering the [[anthropic principle]], it is sometimes interpreted as implying the existence of a [[multiverse]].<ref name="Edwards">{{Cite book |author=Rem B. Edwards |title=What Caused the Big Bang? |publisher=Rodopi |date=2001 |isbn=978-90-420-1407-7}}</ref>

The ultimate fate of the universe, and implicitly of humanity, is hypothesized as one in which biological life will eventually become unsustainable, such as through a [[Big Freeze]], [[Big Rip]], or [[Big Crunch]].

Theoretical [[cosmology]] studies many alternative speculative models for the origin and fate of the universe beyond the Big Bang theory. A recent trend has been models of the creation of 'baby universes' inside [[black holes]], with our own [[Big Bang]] being a [[white hole]] on the inside of a [[black hole]] in another parent universe.<ref name="Poplawski">{{Cite book |title=Radial motion into an Einstein-Rosen bridge, Physics Letters B | first=Nikodem J. |last=Poplawski |volume=687 | date=April 2010 |pages=110–113}}</ref> [[Many-worlds]] theories claim that every possibility of [[quantum mechanics]] is played out in parallel universes.