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‘Cave entrances’ spotted on Mars
BBC News
Posted on 03/17/2007 1:05:05 AM PDT by BlackJack
http://www.freerepublic.com/focus/news/1802271/posts
Windows onto the abyss: cave skylights on Mars
Planetary Society | 5-23-07 | Emily Lakdawalla
Posted on 05/27/2007 1:21:33 PM PDT by Renfield
http://www.freerepublic.com/focus/news/1840637/posts
