(May 8, 2013 at 9:07 pm)Rayaan Wrote:(May 8, 2013 at 8:43 pm)xdrgnh Wrote: 1. Everything in our natural world AKA universe is either matter or space time.
... or energy.
Energy is just a name we call a combination of physical units. All things in physics are just combinations of mass, space and time. Energy is not a distinct thing. Though due to relativity space and time are related to each other via the Lorentz Transform so it's called space time. A quanta of energy the photon is itself matter.