[DOC] [TLE] Age of the universe - Wikipedia [PAR] In physical cosmology, the age of the universe is the time elapsed since the Big 
Bang. The current measurement of the age of the universe is 
700113799000000000013.7990.021 billion years (7010137990000000000(
13.7990.021)109 years) within ... one referred to the same era as "13.8 billion 
years minus 106 seconds ago"... [DOC] [TLE] Big Bang - Wikipedia [PAR] The Big Bang theory is the prevailing cosmological model for the universe from 
the earliest .... Approximately 1037 seconds into the expansion, a phase 
transition caused a ... But eventually, after numerous billion years of expansion, 
the growing .... on resolving certain outstanding theoretical problems in the Big 
Bang theory... [DOC] [TLE] Where will we all be in 100 billion years?  Starts With A Bang [PAR] Aug 23, 2012 ... Over the past 13.7 billion years, we've formed the light elements out of a sea ... a 
black dwarf, that will not have happened after only 100 billion years. ... 
Theoretical view of the Sun as a red giant from a barren Earth ..... Your 6000 
years probably refers to a calculation made several centuries ago ... #20 Wow. [DOC] [TLE] cosmology - What is the theoretical limit for farthest we can see back ... [PAR] Jun 8, 2013 ... 13.2 billion years ago the universe was rather small, having started only half ... If 
this is so, what is the theoretical limit we can see far back in the past? .... 10x as 
long as putting the information as text only? But it makes it so much easier for 
duffers like me to understand it :)  Eugene Seidel Jun 11 '13 at 7:20... [DOC] [TLE] Universe Is Over 13 Billion Years Old  The Church Of Truth [PAR] The universe started with the Big Bang approximately 13 BILLION years ago. ... 
The Big Bang theory does not claim to explain the cause of the Big Bang; merely 
to describe what happened afterward. ... in this video, A Universe From Nothing 
by Lawrence Krauss, a theoretical astrophysicist. ..... October 20, 2015 at 10:16 
AM. [DOC] [TLE] Earth's Bombardment by Asteroids 3.9 Billion Years Ago May Have ... [PAR] May 20, 2009 ... The bombardment of Earth nearly 4 billion years ago by asteroids as large as ... 
Mars and Mercury, and previous theoretical studies to build three-dimensional ... 
which is thought to have lasted for 20 million to 200 million years. ... of the 
asteroid barrage in their simulations by 10-fold -- an event that could... [DOC] [TLE] How can it be understood that the universe is 93 billion light years ... [PAR] The reason for the difference is that, first of all, 13.8 billion light years is 
essentially the radius of ... So, the diameter of 93 billion light years is, at most, a 
theoretical estimate of the current ... Is it scientifically proven that the universe 
was created 13 billion years ago? ... This happens because space is bend at this 
point. [DOC] [TLE] 10 billion years ago, our sky was full of stars being born - The Verge [PAR] Apr 10, 2015 ... Ten billion years ago, however, it would have been hard to ignore. ... stellar-mass 
growth happened within the first 5 billion years of their birth.". [DOC] [TLE] timeline [PAR] Aug 28, 2012 ... 10,300 years ago - End of the most recent glacial period: the ... 4.5 billion years 
ago - Formation of the Moon: according to the Giant Impact Hypothesis, this 
happened when ... 13.7 billion years ago - The Big Bang: beginning of the 
universe as we know it! ... 10 thousand years after the Big Bang - End of the... [DOC] [TLE] The End of Everything - Universe Today [PAR] Dec 26, 2015 ... Modern humans originated in Africa about 200,000 years ago. Since then ... End 
of Life  500 million years  5 billion years. We thank the .... Over a long period of 
time, though, estimated to be between 1019 1020 years. The galaxy ..... The 
question then remains: what happens after the end of everything? [DOC] [TLE] The end of Earth, the end of

Question: It theoretically happened about 10 to 20 billion years ago
Answer: Big Bang Theory