Three asteroids have been recently discovered that appear to be among the oldest objects in our solar system. They are relatively unchanged since they were first formed, thus they could give us clues as to what the Solar System's first few million years of existence were like.
Scientists used a SpeX Instrument and the NASA Infrared Telescope Facility in Hawai'i to study the asteroids. Scientists can tell general age by the presence of CAI, or calcium-aluminum rick inclusions.
P.S. Just a fun fact: today is the point in the moon's orbit where it is farthest from Earth!
http://www.astronomy.com/asy/default.aspx?c=a&id=6757
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