== Eksterne henvisninger ==
* [http://www.geologisknyt.dk/fileadmin/user_upload/GeologiskNyt/Artikler/1997/4/Jordens_alder_foer_og_nu_-_bagsiden_af_geologi.pdf ''Jordens alder før og nu''. Artikel i Geologisk Nyt] {{Webarchive|url=https://web.archive.org/web/20070712233550/http://www.geologisknyt.dk/fileadmin/user_upload/GeologiskNyt/Artikler/1997/4/Jordens_alder_foer_og_nu_-_bagsiden_af_geologi.pdf |date=12. juli 2007 }}
* [http://www.toarchive.org/faqs/faq-age-of-earth.html TalkOrigins.org]{{Dødt link|date=februar 2022 |bot=InternetArchiveBot |fix-attempted=yes }}
* [http://www.vectorsite.net/ Vectorsite.net] – ''Den oprindelige version af denne artikel baseredes på en tekst i "public domain" af [[Greg Goebel]]''
* [http://pubs.usgs.gov/gip/geotime/age.html USGS preface on the Age of the Earth]
* [http://www2.jpl.nasa.gov/snc/nasa1.html NASA exposition on the age of Martian meteorites]
* [http://www.bbc.co.uk/radio4/history/inourtime/inourtime_20031120.shtml "Aging the Earth", BBC Radio 4 In Our Time series, 2003]
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