Zircon

It was recently discovered one of the oldest zircon crystals of the Earth, with about 4.4 billion years that demonstrate the theory of a cold early Earth, a temperature sufficient to have water, so has unable to be dated to the first species or microorganisms are about 3.6 billion years old.
This advance in geology has served to investigate other planets and also know more about the space around us. The next goal is to compare these materials with other nearby planets and find out more about the formation of these.
I hope that later they can make travel and find more interesting things about this, our galaxy.

http://edition.cnn.com/2014/02/24/world/oldest-earth-fragment/index.html?hpt=wo_t5