User talk:Grav-universe

Source needed
Welcome to Wikipedia. Everyone is welcome to contribute to the encyclopedia, but when you add or change content, as you did to the article Time dilation, please cite a reliable source for the content of your edit. This helps maintain our policy of verifiability. Take a look at Citing sources for information about how to cite sources and the welcome page to learn more about contributing to this encyclopedia. Also, please have a look at our policy about original research. Thank you. - DVdm (talk) 17:20, 4 January 2011 (UTC)