Radio, Television, Telephone, and jazz music are some of the things that profoundly transformed entertainment, education, commerce, and research in the 1920s
Answer:
1.) 36 alien civilizations could communicate with us.
2.) The nearest alien could be on Mars which is 54.6 million kilometers
away.
3.) No I don't agree. There could be millions of alien civilisations out there that we haven't found because space is so big.