Mercury spewed 'dark blue material'

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That material was seen with NASA's first partial view of Mercury by Mariner 10 in the 1970s. It was spotted again in Messenger's first images of Mercury's unseen side earlier this year. The latest Messenger images, added to earlier photos show about 95 percent of the planet, and the blue stuff was in many places, more than astronomers had anticipated.

Really cool looking stuff!

Wow that is definately a cool find there. I wonder thought what kind of substance it could really be. I mean we are equating it to an earthly base of knowledge which is most likely false if you ask me. Just becauesd it spewed it doesnt mean its some form of valcano or lava.