This picture is taken at a distance of 6.4 billion kilometers from the Earth**, and you can see that the Earth is very small, and it was taken by the famous Voyager 1 probe.
Voyager 1 is an unmanned space probe developed by NASA, due to the special geometric arrangement of planets that occurs once in a century, Voyager came into being, and one of them is Voyager 2.
On September 5, 1977, the Voyager 1 probe was launched from Cape Canaveral Base in Florida, USA, and then accelerated by the planetary gravitational slingshot effect to explore Jupiter and Saturn.
However, when Voyager 1 was exploring Saturn's moon Titan, it deviated from the ecliptic plane of the solar system due to the failure of the orbit change, so it could not continue to explore other planets and flew outside the solar system, and the remaining planets were handed over to Voyager 2.
On February 14, 1990, after 13 years of flight, the Voyager 1 probe arrived at a position 6.4 billion kilometers away from the Earth.
From the picture, we can hardly make out the appearance of the earth, because it only accounts for 012 pixels. Therefore, the famous astronomer Carl Sagan later gave him a very special name, called the faint blue dot.
The dim blue dot makes many people think deeply, because our daily joys, sorrows and sorrows occur on this inconspicuous blue dot, which can't help but sigh how small the earth is in the universe.
However, the faint blue dot is only 6.4 billion kilometers away from the earth, we know that the solar system is actually very vast, its radius reaches about 1 light year, which is equivalent to a 2 light years of spherical space, and the outermost is the Oort cloud that envelops the solar system, if we want to leave the solar system, then only flying out of the Oort cloud can be regarded as really leaving the solar system. But according to Voyager 1, which has flown the farthest distance of human beings, it will take at least tens of thousands of years to fly out of the solar system!
However, with the continuous understanding of the universe, astronomers tell us that the solar system is actually only in the larger Milky Way, and the diameter of the Milky Way is about 10-160,000 light-years, of which the number of stars is at least more than 200 billion, and our sun is an insignificant star among the trillions, and he is leading us around the center of the Milky Way at this moment.
So now do you think the Milky Way is already big?In fact, for the large scale of the universe, the Milky Way is just a dust, because the number of galaxies in the universe is beyond our imagination, and they will also gather together to form a larger structure, such as the Milky Way is the local galaxy group, which is a small group of 50 galaxies. Among them are the well-known Andromeda Galaxy, the Triangulum Galaxy, etc., with a diameter of about 10 million light years.
However, the Local Group is not the largest structure, and there is a larger Virgo Cluster above the Local Group, which is made up of hundreds of galaxies with a diameter of about 1100 million light years.
There are still larger structures above the Virgo Supercluster, which is the Laniakea Supercluster, which is part of the Pisces-Cetus Supercluster complex, and the Pisces-Cetus Supercluster complex, which is part of the Pisces-Cetus Supercluster complex and has a diameter of 5It is about 200 million light-years away and contains about 100,000 galaxies.
The Pisces-Cetus supercluster complex is the largest structure in the universe, that is, the Great Wall of the Universe, with a diameter of 1 billion light years. It's all in the observable universe as we know it, a spherical space with a diameter of about 93 billion light-years.
However, this is not the true size of the universe, but the limit of what we can observe, and since the light of a distant celestial body 930 light-years away has not yet reached Earth, we know nothing about what is known to be observable.