@ABC How? How can they know this? That's more amazing than how old Mercury's magnetic field is.
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@ABC Says who?Thanks. Twitter will use this to make your timeline better. UndoUndo
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“
@ABC:#Mercury's#MagneticField found to be at least 3.7 billion years old-http://abcn.ws/1QBUywx pic.twitter.com/WqTLyOy3OK”
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@ABC So...what if the sun is older then people thought and earth much younger?Thanks. Twitter will use this to make your timeline better. UndoUndo
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