They were both inhabited worlds once; but the dwellers in the Sun have ages ago lived their lives and passed to the Central Sphere.

The Sun is nothing now but a burning world, burning rapidly, and surely, away: or rather, IT IS BEING ABSORBED BACK INTO THE ELECTRIC CIRCLE FROM WHICH IT ORIGINALLY SPRANG, TO BE THROWN OUT AGAIN IN SOME NEW AND GRANDER FORM.

And so with all worlds, suns and systems, for ever and ever.

Hundreds of thousands of those brief time-breathings called years may pass before this consummation of the Sun; but its destruction is going on now, or rather its absorption--and we on our cold small star warm ourselves, and are glad, in the light of an empty world on fire!" I listened with awe and interest.
"And the Moon ?" I asked eagerly.
"The Moon does not exist.

What we see is the reflection or the electrograph of what she once was.