If we were to intercept a strong radio signal at 1420 MHz in binary format from another civilization, this would be an example of
A) a signal used for communication between a civilization's home world and another planet in its own planetary system
B) a signal used for local communication in the world where the intelligent beings exist
C) an intentional signal beacon
D) a signal used for communication between a civilization's home world and another star system

Question

Quizplus · Accepted Answer

1420 MHz is a common frequency used for intentional signal beacons by intelligent civilizations searching for extraterrestrial life. This frequency corresponds to the emission of neutral hydrogen and is therefore considered a universal language that intelligent beings across the universe can understand. Therefore, intercepting a strong radio signal at this frequency would likely be an intentional signal beacon from another civilization.

If We Were to Intercept a Strong Radio Signal at 1420