On Fri, 13 Jul 2007 19:45:36 -0000, Radium
wrote:

When the sun becomes a white dwarf, approximately how long will it
take for it to cool off to a cold black dwarf that does not emit
anymore heat or light [or other energies] than the surrounding space?

It takes a solar type star about 100 billion years, which is more than
the presently estimated age of the universe.

Bud
--
The night is just the shadow of the Earth.