As shown above, which contributes the most to the total noise in the region that may be likely for interstellar communication?

Question

Quizplus · Accepted Answer

Background radiation and/or noise from Earth's atmosphere contribute the most to the total noise in the region that may be likely for interstellar communication. Noise from the galaxy and quantum mechanical noise are also present, but they are relatively minor compared to the background radiation and atmospheric noise.

As Shown Above, Which Contributes the Most to the Total