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Line 202: {{main\|String cosmology}} [[File:~~Ilc~~WMAP ~~9yr moll4096~~2012.png\|thumb\|right\|300px\|A map of the [[cosmic microwave background]] produced by the [[Wilkinson Microwave Anisotropy Probe]]]] The Big Bang theory is the prevailing [[physical cosmology\|cosmological]] model for the universe from the earliest known periods through its subsequent large-scale evolution. Despite its success in explaining many observed features of the universe including galactic [[redshift]]s, the relative abundance of light elements such as [[hydrogen]] and [[helium]], and the existence of a [[cosmic microwave background]], there are several questions that remain unanswered. For example, the standard Big Bang model does not explain why the universe appears to be the same in all directions, why it appears flat on very large distance scales, or why certain hypothesized particles such as [[magnetic monopoles]] are not observed in experiments.<ref>[[#Becker\|Becker, Becker and Schwarz]], pp. 530–531</ref>

String theory: Difference between revisions