wrote in message ...

I have read where it can take 100,000 years for light generated in the
sun's centre, to reach the surface. ...Would this imply that a newly
formed sun would basically look like an extremely large Jupiter.... And
then, over thousands of years, would gradually light up? ...Jon

No, a newly formed sun would be glowing already from the
heat released due to gravitational contraction; it would
be bright even before fusion kicked in. Remember, it's
the pressure and heat at the core due to gravitational
contraction that inititally gets the temperature up high
enough for fusion to begin.

Of course the sun will get much brighter once the fusion
process kicks in, and that will take some time to show
at what will be the surface of the sun -- there will
still be infalling material and some of this will be
blasted away by the newly ignited sun, thus defining
its surface.