Um, I’ll let you go now.

Ivan.

Or is it?

Could that void be just a “matter of degree” of voidness? There could be a much less dense interstellar space there? Or maybe actually a much more dense Dark Matter?

Fill me in.

Oh and one more thing. That junction between the two balloons would be rather compressed, like double , from the two gigantic pressure waves crashing into each other at twice the velocity of either. (I realise that actual balloons have a relatively stable pressure before they burst, unlike the supernovas which are essentially expanding from point sources.)

Well that is the way I see it.

Ivan.

If you mean a main sequence star Kaptain K, that would be millions, not billions.
You’d encounter billions of Kelvin in very, very large stars or supernova.

I wonder if the image released to remind people that Hubble is far from blind even though the ACS bit the dust?

The white dwarf is what remains of the core of the progenitor star.The temperature of a “working” star is in the billions of kelvins. After the outer parts of the star are shed (creating the planetary nebula) the exposed core cools, quickly at first, more slowly as it ages. The surface temperature is an inverse function of its age.