What would a civilization within 60 light-years away be able to detect from Earth?
A) our first TV transmissions
B) our cellular phone transmissions
C) our production of machines that create noise
D) our excessive carbon emissions
E) our wireless Internet transmissions

Question

Quizplus · Accepted Answer

Civilizations within 60 light-years could detect our first TV transmissions because they were broadcasted over 60 years ago and have had time to travel that distance through space.

What Would a Civilization Within 60 Light-Years Away Be Able