If one day humans disappeared, the earth became riddled with holes in disasters, high-rise buildings were gradually ground into rubble by nature. Is there anything in the universe that can prove the existence of brilliant human civilization?
The answer is yes, it is not only on the earth, but from the tens of billions of miles in outer space: humans are wandering travelers number one and number two, number one traveler furthest distance, and have reached 22.4 billion kilometers away. They are working towards the boundary in the solar system. It is a one-way ticket to the depths of the universe 39bet-đua chó-game giải trí -đá gà-đá gà trực tuyến-đánh bài.
A man named Gary Flandreau worked part-time at NASA's Jet Propulsion Laboratory in California. At a time when the United States was desperate to explore the outer solar system and send probes to Jupiter, or even Saturn or Neptune, Flandreau's mission was to find the most efficient way to get them there.
Using a very sophisticated tool: a pencil, he plotted the movements of the target planets, and was surprised to find that in the late 2070s and early 2080s, the four planets would form a special arrangement, like a celestial necklace with Earth.
This kind of phenomenon is not common. The last time the formation of this special arrangement has been hundreds of years ago. Its significance is not only looks good, more is that it can provide gravitational booster for detector, detector after these planets will be captured in the planet's gravity, the planets will pass their own momentum to the probe.
And obtain kinetic energy after acceleration detector, and escape from the planet. It's like when you were in rotation, snatched the others to a hammer, you continue to take the hammer throw rotation and throw it again, then the speed of the hammer will be accelerated, and your speed will slow down, but the quality of the detector relative to the planets, the loss of kinetic energy is negligible.
This method is not too costly, the spacecraft can continuously gain speed, four planets can get repeated gravity boosts continuous acceleration. According to Flandreau's calculation, the probe after four gravity boosts, the flight time to Neptune can be reduced from 30 years to 12 years.
As we said above, this is a rare occurrence, occurring only once every 176 years, which meant that NASA had to seize the opportunity to launch a probe in the mid-1970s. NASA took the plunge and decided to take advantage of this once-in-a-generation opportunity by designing Voyager's sister probes, Voyager 1 and 2.
The two are almost identical, with the only difference being that Voyager 2 travels slightly slower, allowing it to stay on the ecliptic plane.
Voyager 1 and 2 were launched in the summer of 1977 and have been in space for 45 years, having actually completed their mission in 1990.
Travelers first allow scientists to see the close-up images of Jupiter, and discovered for the first time on IO's volcanic activity. This is the pioneer 10 and 11 before have not found. Before that, scientists have long thought that these lifeless planets would look like the moon, and is, in fact, they are very active.
Voyager 2 became the first probe in history to fly by Uranus in 1986. It flew by Neptune three years later, and it still holds the travel record. No probe has traveled this far since then.
Originally designed to last only four years, Voyager has overachieved. Most satellites use solar panels to power themselves, and at 23.3 billion kilometers from the sun, Voyager is no longer receiving enough sunlight to sustain itself.
Its ability to keep flying depends on its nuclear heart: a battery of isotopes, radioactive isotopes that produce fission reactions that release huge amounts of energy, and elements with long half-lives of at least 60 years or more.
However, the isotope batteries used up a lot of power during the mission, so only basic flight and communication functions have been turned on to keep the voyagers in contact with Earth for a longer period of time. Even so, the signals from the voyagers are still very weak, which will require more efforts to receive them on Earth.
NASA has built a network of deep space probes in three locations around the world that can communicate continuously with travelers as they rotate, ensuring that there are no communication blind spots as the Earth rotates.
But even with an optimal network of receivers, 22.4 billion kilometers would still be an untouchable distance, making communication signals between the two strong and weak, and travelers would be completely cut off from Earth by about 2025.
But Voyager will still be of great significance in the future, because it will carry basic information about humanity and map the location of the solar system. It will have a golden record player that will still play intact in a billion years, and it will contain recorded greetings and classic music in every language.
In about 70,000 years, Voyager 1 will reach the Sun's nearest neighbor, Proxima Centauri, and after passing it, continue on toward the center of the Milky Way.
Perhaps it will never be captured by aliens, but it always carries the hope that one day humans will build more advanced space probes to continue the journey of exploration for travelers.