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

Question

Responses

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

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.

Answer 1

To characterize a nebula as diffuse means that its edges do not have clear boundaries. This is typically because diffuse nebulae consist of gases and dust that are spread out over a larger area, making them appear to blend into the surrounding space without sharp outlines.