As the farthest man-made object from the earth, Voyager 1 can be said to have attracted much attention, and its”twin brother”-Voyager 2, seems to be left out. In fact, this kind of”treatment” is not fair to Voyager 2, because after Voyager 1″visited” Saturn, it left the ecliptic and flew straight to the outer solar system, while Voyager 2 It continued to”visit” Uranus and Neptune. Relatively speaking, its contribution should be greater than that of Voyager 1.
After flying for 4.1 billion years, Voyager 2 reached the boundary of the solar system heliosphere, the end of the solar wind, in November 2018. Today, the Voyager 2 probe is about 20 billion kilometers away from us.
On August 20, 1977, Voyager 2 was launched from Cape Canaveral, Florida, USA, becoming the first spacecraft in history designed to observe the solar system from outside.
According to current knowledge, the sun’s gravity can affect 1-2 light years away, which is what scientists think is the radius of the solar system. However, in addition to the range defined by gravity, scientists have also proposed another”solar system range”, which is the heliosphere.
When humans appeared on the earth, the earth has entered the era of civilization. Because no creatures can purify higher civilizations before humans, the level of civilization on the earth has become higher and higher after the birth of humans. When exploring the universe, human beings also want to find other civilizations in the universe.
The solar system is a planetary system bounded by the gravity of the sun, including 8 planets including water, gold, earth, fire, wood, and earth, as well as at least 173 known satellites, 5 dwarf planets that have been identified, plus Hundreds of millions of small solar system objects and Halley’s comet.