पहला कृत्रिम उपग्रह, स्पुतनिक 1, किस देश द्वारा सफलतापूर्वक अंतरिक्ष में प्रक्षेपित किया गया था?

In which year did the United States launch its first dedicated space station, known as Skylab, into Earth's orbit?

Which was the first man-made satellite launched into space in the year 1957?

What conclusion can be drawn about humanity's historical efforts to communicate with extraterrestrials?