Taking the solar gravitational influence range, then the radius of the solar system is up to 2 light years, about 946 trillion kilometers, very large, from the inside to the outside, the sun, the eight planets, the Kuiper Belt, and then the Oort Nebula, of which the Kuiper Belt and the Oort Nebula are the most mysterious regions of the Solar System.
Why, because there are a large number of uncertain objects in the Kuiper Belt and the Oort Nebula, there are constantly objects affected by gravity to leave their original positions and approach the Sun, and the Oort Nebula is the birthplace of comets, especially the Oort Nebula, from which the vast majority of large comets comets come from.
Now, astronomers have discovered the largest interstellar comet in history in the Ault Nebula through the Hubble Space Telescope, C/2014 UN271, with a huge structure, do you know how big it is? With a diameter of more than 140 kilometers, the average diameter of the famous Halley's Comet is only about 11 kilometers, which is more than ten times the length of Halley's Comet.
In February 1986, when Halley's Comet approached the Earth and space, we could clearly see halley's comet in the sky, dragging hundreds of thousands of kilometers of long tails, known as "broomstick star", if this 140 km diameter comet approached the earth, this spectacular scene must be more exciting.
Unfortunately, the largest interstellar comet ever made will not come close to Earth and the Sun, it is located in the farthest reaches of the Oort Nebula in the Solar System, and although it has been flying toward the Sun for 1 million years, it is still very far away, reaching its perihelion position in 2031, about 1.5 billion kilometers from the Sun.
1.5 billion kilometers is about 15 times that of the Earth and the Sun, located on the outer side of Jupiter's orbit, so C/2014 UN271 is invisible to the naked eye, it needs to be seen through a professional astronomical telescope, it is the largest comet in history, and when the time comes, astronomers will definitely explore it and study the mysteries of the Oort Nebula object.
When it comes to comets, it's easy to think, C/2014 UN271 comet will produce a comet tail, will comets split a lot of comet debris? Is it a threat to the planet? Indeed, Halley's Comet produced a large amount of debris as it approached Earth, and now these fragments bring periodic meteor showers to Earth every year, which is a threat.
So, what about C/2014 UN271 Interstellar Comet? In fact, it certainly won't, mainly because the perihelion of comet C/2014 UN271 is too far away from the sun at 15 km, and the heat of sunlight cannot melt the comet, so it will not produce a comet tail, will not produce comet debris, and will not cause any impact on The Earth.
In 2017, an interstellar visitor named Oumuamua visited the solar system, which may come from more distant interstellar space, and It is very strange that Oumuamua has a more strange shape, 400 meters long, 40 meters wide, 10 times the length-to-width ratio, and is still rotating.
As a result, various theories about Aumua have come, and some experts believe that Aomo may be a light-sail spaceship of aliens, and it may be like the spaceship sent by the alien civilization of the "Three-Body" novel to find the planet of life, so we must hurry to build a super spaceship to catch up with it.
Some experts believe that Oumuamua may be an alien spaceship abandoned by aliens, because Oumuamua has traveled in interstellar space for millions of years, so long that aliens may have perished inside, leaving an empty spaceship and wandering around.
So, could C/2014 UN271 be an alien giant spaceship? It's uncertain, and when it reaches its nearest point, astronomers will certainly take a look at it, and there's no way but to wait until 2031, which will be a long waiting process. Interesting scientific exploration content, please pay attention to the only WeChat public account: Interesting Exploration