Almost black holes

stevebd1

In the paper posted by Chronos, M refers to mass, in the post I made, M is the geometric unit of mass, sometimes referred to as the gravitational radius where M=Gm/c² where G is the gravitational constant, m is the mass in SI units (i.e. kg) and c is the speed of light in m/s.

grantwilliams

If a photon is considered to be without mass how can light have momentum?

note: my only exposure to physics has been in an AP mechanics class and in the books i've read over this summer. (i won't begin more formal study until i begin college next fall)

Drakkith

The momentum and energy of a photon is determined by the frequency. Higher frequency photons have more momentum and energy. You can read a bit more here: http://en.wikipedia.org/wiki/Photon#Physical_properties

If that isn't detailed enough or doesn't answer your question just say so.