In planets of the solar system, the diameter of the earth ranks fifth after Jupiter, Saturn, Uranus and Neptune. It is not big among the eight planets, but it is definitely not small. After all, there are Venus, Mars and Mercury after the earth!
The diameter of the earth is about 12,7 kilometers, the diameter of Jupiter is about 14, kilometers, and the diameter of the sun is as high as 1.4 million kilometers, so the earth is a tiny one by comparison, because Jupiter can hold 1,3 earths, while the sun can hold 1.3 million earths. If calculated by mass, the planets in the whole solar system are nothing!
Because the sun accounts for 99.86% of the total mass of the entire solar system, while Jupiter accounts for 71%, and the Earth is only about .299714%, how many planets like the Earth are there in the universe? It is about 2-3 times that of a star, and there are about 1-4 billion stars in the Milky Way, so there are about 2-8 billion brothers on the earth, and there may be as many as 2 trillion galaxies in the universe. As you can imagine, the status of the earth is really like a dust in the universe, even worse!
how big is the shield UY?
Shielding is probably the largest star ever observed. It is a red Supergiant star with a diameter of about 1,78 192 times that of the sun. If it is placed in the solar system, its peripheral diameter will reach the orbit of Saturn, and its brightness is extremely high, which is 34, times that of the sun! However, because it is more than 51 light years away, the apparent magnitude is only 9, and if it is calculated 32 light years away, the absolute magnitude will reach -7.26! About 6.5 times as bright as Venus!
how will UY develop in the future?
shield constellation UY is actually a virtual fat man. It is a star that has developed to the stage of red giant, which has been extremely inflated, but its mass is only 7-1 times that of the sun. That is to say, in this huge diameter, the density of many areas is lower than that of air, and the super radiation pressure and gravity weaken the edge constraint, and it is losing mass greatly!
But don't underestimate this virtual fat man. Its core is going through the final stage. In the future, the radiation pressure of the core will disappear and collapse, which will lead to a supernova explosion. A supernova explosion of this mass will form a neutron star. If its magnetic pole is inconsistent with its rotation axis, it will form a pulsar! This event may happen in hundreds of thousands of years!
The diameter of Saturn's orbit is about 9-1 astronomical units, and the shield UY is slightly smaller than Saturn's orbit. If the earth is that big, its diameter will exceed 2.4 billion kilometers and its circumference will be about 7.5 billion kilometers! What is this concept? Let's make an analogy.
the latitude of Ningbo: 28 51' to 3 33' north latitude
the latitude of Shanghai: 3 4' to 31 53' north latitude
The minimum latitude difference between them is only about one degree. If calculated according to the diameter of the earth, it is about:
4, km /36=111 km.
It takes about one hour to drive in a straight line at high speed. Of course, the road from Ningbo to Shanghai is winding, so it takes about 2-3 hours! But if you reach the surface of the shield, the distance corresponding to one latitude will be expanded to:
7.5 billion kilometers/36 = 2.83 million kilometers
which is about 1/7 of the distance between the sun and the earth. If you drive at 1 kilometers/hour, it will take about 3,472 days, which is about 9.5 years!
if you fly by a jet plane with a speed of 1 km/h, it will take less than a year, which seems acceptable! Of course, if you are on such a big celestial body, everyone will have the land area to ensure that you can't walk all your life! But I'm sorry, such a planet does not exist!
Because the mass of an object of this size has already exceeded Oppenheimer's limit, it will collapse directly into a black hole under its own gravity, and its mass will be at least 2.53 billion times that of the sun, and the black hole in the center of the Milky Way is only about 4 million times that of the sun, so it is really impossible for the earth to be big!