The bottom of the ocean is so last week. Richard Branson has decided to one-up James Cameron by launching an expedition to the center of the earth. Launching Virgin Volcanic, Branson will plunge toward the core of our planet using a screw-shaped vessel that can drill through the magma of an active volcano. His star-studded team of “Volcanauts” traveling with him will include Tom Hanks, will.i.am and Seth Green. After we reach the center of the earth, what’s the next unexplored frontier?