How did the first spacecraft test if they could communicate with people on Earth, and were there any challenges that they had to face in doing so?

Question

How did the first spacecraft test if they could communicate with people on Earth, and were there any challenges that they had to face in doing so?

In: 8

Answer 1

Wireless communications had already been invented and understood very well. Basically the conversation boiled down to “do radio waves work in space? Yes we measure them in space all the time. cool we will use radio waves then “.