Question

what does it mean to characterize a nebula as diffuse? (1 point)
its edges do not have clear boundaries.
its edges have clear boundaries.
it reflects only non - visible radiation.
it reflects only visible radiation.

Explanation:

A diffuse nebula is characterized by its lack of clear - cut edges. The term "diffuse" implies a spreading out or lack of sharp demarcation. Non - visible or visible radiation reflection is not related to the term "diffuse" in the context of nebula characterization. A nebula with clear boundaries would not be called diffuse.

Answer:

Its edges do not have clear boundaries.