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Intergalactic "G" Mail?

Every Wednesday, Michio Kaku will be answering reader questions about physics and futuristic science.  If you have a question for Dr. Kaku, just post it in the comments section below and check back on Wednesdays to see if he answers it.

Today, Dr. Kaku addresses a question posed by Aaron Anderson: Can we utilize the orbital gravity of the outer planets to propel messages far beyond our solar system?

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