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 visible radiation.
It reflects only visible radiation.

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

It reflects only non-visible radiation.

Answer 1

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