User talk:2405:204:6428:E7E5:F343:F199:C5D9:184

April 2019
Please do not add or change content, as you did at Expansion of the universe, without citing a reliable source. Please review the guidelines at Citing sources and take this opportunity to add references to the article. Thank you. - FlightTime  ( open channel ) 17:50, 21 April 2019 (UTC)