The image you see now, called the faint blue dot, was taken by Voyager 1 on Valentine's Day in 1990, 6.4 billion kilometers from Earth, just past Saturn, ready to head farther to the boundaries of the solar system.
In view of its never-ending journey, NASA decided to turn the camera around and take a family portrait of the solar system, from which the faint blue dot was captured.
Before this picture appeared, although many people knew that the earth under their feet was nothing more than an insignificant grain of sand in the universe, they did not psychologically accept this fact, in the past century, they had mastered the huge energy of nuclear fission and nuclear fusion, built complex intelligent machines with electrical impulses imprisoned in silicon wafers, and thought that they had mastered the power to conquer the universe, and even the universe existed for them.
But the appearance of the faint blue dot, for the first time, people intuitively see the insignificance of the earth in the universe, in the past, the photos of the earth taken from space were blue sea and white clouds, but this time there is nothing, only a faint light point of 0.12 pixels, there were 5.26 billion people at this point, and now there are 8 billion people.
The fragility of the earth, the fragility of human civilization, can be seen at a glance in this photo, only one asteroid impact, or a nearby supernova explosion, or a sneeze from the sun, human civilization will have to be reimbursed on the earth, so now Musk is going to Mars, and after becoming a multi-planetary species, the survivability of human civilization will also be greatly improved.
But whether it is the earth or the solar system, it is actually a very small existence in the universe, because there are up to 400 billion stars in the Milky Way, and it is only a part of the galaxy cluster composed of the Andromeda galaxy galaxy and more than a dozen galaxies around it.
Finally, there is the observable universe with a diameter of 93 billion light years, but this is not the end, astronomers believe that there is more than 250 times the volume of the observable universe outside the observable universe, and the universe we see is only a small area that has been divided due to the speed of light limitation and the expansion of the universe beyond the speed of light.
In the foreseeable future, even if you drive a light-speed spaceship, it will be impossible to reach the edge of the universe in your lifetime, and as for the wormhole predicted by Einstein, it is difficult to appear today when the structure of space-time is so stable, so some astronomers believe that the final expansion range of human civilization is a few light years, and there will be a communication time difference in the distance.
Further, if the speed of light is impossible to be surpassed, then all civilizations in the universe are likely to be imprisoned within a few light-years, and it is unlikely that they will be able to detect each other, let alone communicate, which may be the answer to Fermi's paradox and the reason why we can't find extraterrestrial civilizations.
At this time, more than 20 billion kilometers away from the earth, Voyager 1 is still trudging lonely towards the galaxy's sea of stars, which looks like a strange umbrella from the outside, with a parabolic antenna aimed at the earth, and a gold-plated disc record on both sides, which shows the position of the solar system and the earth in the universe, as well as the sound of the earth's sea, the chirping of birds, and the ancient Chinese song "flowing water".
Whether human civilization still exists or not, it will continue to fly in space.