1.1 billion years centros de millóns de anos Hundert Millionen Jahren http://math.ucr.edu/home/baez/timeline.html#bang timeline A Brief History of the Universe historia wiata hundred million years http://math.ucr.edu/home/baez/timeline.html 250,000 years centenares de millones de años 1.1 billion years time 1.1 billion years According to John Baez 1.1 billion years