what it's like to orbit earth by day, night, with northern lights, and over lightening storms. by Tomislav Safundžić. Image courtesy of the Image Science & Analysis Laboratory, NASA Johnson Space Center.
Paul Steinhardt of Princeton University has proposed a "Ekpyrotic Model" of the Universe that describes our current universe as arising from a collision of two three-dimensional worlds (branes) in a space with an extra (fourth) spatial dimension. The proposal is interesting in and of itself, but also because it is the precu...See More — with August Depner. Unlike · · Share