What does it mean to characterize a nebula as diffuse?(1 point)

Question

Responses

Its edges have clear boundaries.
Its edges have clear boundaries.

It reflects only non-visible radiation.
It reflects only non-visible radiation.

It reflects only visible radiation.
It reflects only visible radiation.

Its edges do not have clear boundaries.
Its edges do not have clear boundaries.

Answer 1

To characterize a nebula as diffuse means that its edges do not have clear boundaries.