S. had started during 1959. After Sputnik 1 and 2, US launched its first satellite called Explorer. After this, Vanguard program was initiated and it was the fourth artificial satellite in Earth’s orbit, and is today the oldest satellite still in orbit. Vanguard program made few unsuccessful attempts before TV-4 was the first Vanguard satellite to make it into orbit and be a total success. However, none of the previous fails were a complete loss, as each of them provided more telemetry and information necessary to make the final success of TV-4, also called Vanguard I. After Vanguard I followed Vanguard II and Vanguard III, each more sophisticated than the previous. Vanguard I and II were very similar in that they had almost the same parts and size, but Vanguard III included an X-Ray scanner, a magnetometer, and encoding technology, which made it more sophisticated than all previous successful …show more content…
The man was attached to a tether attached to the spacecraft, going at nearly five miles a second. This was very dangerous, as even the slightest rays from the sun were thought to be dangerous enough to kill him in an instant if he was exposed. If his tetherline broke, he could not get back to his spacecraft, and would be left in space forever. Also, even the way it was, he did not have any devices which allowed him to steer back to the spacecraft. According to the second paragraph, many were scared and believed that a second craft would be launched, too, linking the already existing spacecraft and creating a space