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* [http://www.nasa.gov/topics/universe/index.html Exploring the Universe] {{en}} a Nasa.gov
* [http://www.nasa.gov/topics/universe/index.html Exploring the Universe] {{en}} a Nasa.gov
* [http://www.zideo.nl/index.php?option=com_podfeed&zideo=6c4947596d673d3d&playzideo=6c3461566f56593d The Size Of The Universe, understand the size of the universe by starting with humans and going up by powers of ten ] {{en}}
* [http://www.zideo.nl/index.php?option=com_podfeed&zideo=6c4947596d673d3d&playzideo=6c3461566f56593d The Size Of The Universe, understand the size of the universe by starting with humans and going up by powers of ten ] {{en}}
[[Categoria:Astronomia]]
[[Categoria:Astronomia]]
[[Categoria:Espai]]
[[Categoria:Espai]]
[[Categoria:Cosmologia]]
[[Categoria:Cosmologia]]