Final answer:
Messages in signals are encoded using various methods, and deciphering them requires understanding and applying the appropriate decoding process. Recognizing messages from alien species is challenging and could involve analyzing patterns and characteristics of the signal.
Step-by-step explanation:
The message in a signal is encoded through various methods, depending on the communication system being used. In terms of deciphering the message, it requires understanding the encoding scheme used and applying the appropriate decoding process. For example, in digital communication, messages are converted into binary code using encoding techniques such as amplitude shift keying (ASK), frequency shift keying (FSK), or phase shift keying (PSK), which are then decoded at the receiver using the inverse process.
Recognizing a message from a completely alien species is a challenging task. It might take a form that we don't expect, as their communication methods and encoding schemes could differ significantly from ours. To decipher such a message, scientists would have to analyze and study the patterns, structures, and characteristics of the signal to identify any meaningful information.