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- Wed Oct 03, 2012 8:25 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Unusual Spheres on Mars (2012 Sep 25)
- Replies: 45
- Views: 6838
Re: APOD: Unusual Spheres on Mars (2012 Sep 25)
This pebble I found in my garden. It is a half broken ball of flintstone, about 3.5 cm diameter, inside hardened sand... http://www.pmach.de/images/geode1.jpg http://www.pmach.de/images/geode2.jpg http://www.pmach.de/images/geode3.jpg http://www.pmach.de/images/geode4.jpg http://www.pmach.de/images/...