Mankind's curiosity to know the unknown has been going on since the beginning of creation. And that is probably why we or the entire human race are so advanced today. There was a similar curiosity in space exploration among scientists in the past. Today, as a result, we can read so much information about space on the pages of the book. In the 1960's, scientists had nothing but telescopes to look at the earth's satellite moon or all the planets in the solar system. All the planets in the solar system were observed from Earth with the help of telescopes. But scientists needed more accurate and precise information, which could not be obtained from Earth.
Astronauts needed a spacecraft that could take pictures of each planet from close range. With this in mind, in 1964, NASA's Jet Propulsion Laboratory researcher Gary Flandro launched a mission called the Grand Tour Program. But the mission failed for some reason. In fact, none of the astronauts wanted to miss the 1980s, because in the 1970s, the other six planets, including Earth, would move in the same straight line. As a result, any spacecraft from Earth will be able to collect pictures of all the planets very easily and very quickly. The position of such planets in the solar system occurs only once in 175 years.
Now you may realize how much influence the 70s have had on space exploration. After the first mission failed, NASA announced a mission called Voyager. The Voyager mission had two parts, Voyager-1 and Voyager-2. Finally, Voyager 2 was launched on 20 August 1977 and a few days later, on 5 September 1977, Voyager 1 was launched. Both spacecraft had no chance of returning to Earth. Voyager was created to complete the mission to the solar system. But in the meantime, the astrologer Carl Sagan came up with an incredible idea. In the 1970's, Carl Sagan was one of the leading astrologers who, like everyone else, believed that there were aliens or aliens in the universe in addition to mankind. Voyager 1 and 2 will go to the very end of the solar system, then the two spacecraft will have no more work.
That's why NASA is thinking of sending some of the existence of the earth and the human race with these two vehicles. But even before that, in 1972, NASA launched a special mission called 'Pioneer' where two images of people on a steel plate inside the vehicle and some signals were given about the vehicle. Carl Sagan came up with some different ideas in these two vehicles, he made two ‘recording cassettes’ of equal weight of steel plate. Where human history was described, some information in 55 languages from all over the world, about 120 images including pictures of human life, sun, earth, sea, houses, plants. There are also music from different communities from all over the world. Both cassettes were made for the purpose that Voyager-1 and 2 would traverse an unknown planet after passing the last planet in the solar system, so that if there were any advanced civilizations in the near future, they would be able to analyze the message we sent. They will know that there was something called earth and human race in this universe. If the earth were to be destroyed in the future, the message sent to Voyager would last forever.
If Voyager ever arrives in an alien world, they will know our address. Carl Sagan gave the mission a different kind of thrill that inspired the members of the Voyager mission. The existence of an alien civilization was much bigger than what astronauts knew about a planet. The largest space mission in human history was launched in 1977, combining the successful efforts of all the engineers, scientists, astrologers and endless mathematical formulas of the Voyager mission for the next 5 years after 1972. Although Voyager-2 was launched earlier, it went ahead after 5 months due to the high speed of Voyager-1. After that the real mission of the two spacecraft started.