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

Question

Responses

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

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

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

Its edges have clear boundaries.

Answer 1

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