UY Scutum is the largest known star. If it comes to the center of the solar system and replaces the sun, then we humans on earth will live in a sea of ????fire. The scope of this sea of ????fire is simply incredible. Because we are about 150 million kilometers away from the center of this sea of ????fire, but we are more than 1 billion kilometers away from the edge of the sea of ????fire. This huge sea of ????fire is Uy Scutum itself. It is impossible to watch the sunrise here, because we are in uy Scutum, and it can be said that it is everywhere we see. If we want to watch the sunrise like we do now, we need to move the position of the earth to Beyond Neptune.
There is no largest celestial body in the universe, only bigger. We live on the earth and feel that the earth is very big. However, the volume of Jupiter, which is also a planet, is more than 1,300 times larger than the earth, and the sun is larger than the earth. Jupiter is 1,000 times larger and 1.3 million times larger than our Earth, but what about comparing it to UY Scutum? Then the sun and the earth are far apart.
The diameter of Uy Scutum is more than 1,700 times that of the sun. The distance from our earth to the sun is only 100 times the diameter of the sun. Therefore, if Uy Scuti is placed in the center of the solar system, then the center of Uy Scuti will be The distance to the edge (the radius of Uy Scutum) is 8 times farther than the distance from the Earth to the Sun, so if you do this, then the Sun and Mercury, Venus, Earth, Mars, the asteroid belt, Jupiter, etc. can only be in the constellation of Scutum. uy's body moves, and these stars only occupy an extremely small space.
In our solar system, the sun is a giant. Most of us have heard of such a ratio of stars, that is, the distance between the earth and the moon can accommodate eight major planets. However, the distance between the earth and the moon is The distance between the Earth and the Moon is only 380,000 kilometers, but its diameter reaches 1.4 million kilometers. Therefore, the distance between the Earth and the Moon is less than 1/3 of the diameter of the Sun. However, this distance can accommodate eight planets. You can imagine that the eight planets and How big is the gap compared to the sun? If we compare them based on volume alone, the eight planets are only equivalent to 1/500 of the sun. It can be said that the gap is huge.
However, how big is the gap between the Sun and Uy Scutum? Speaking of which, this gap is so huge that it is unimaginable, because our huge sun is only equivalent to 1/4.5 billion of Uy Scuti, which means that Uy Scuti is 4.5 billion times larger than our sun. Isn’t it a bit Incredible feeling? We are both stars, why are you so different? If the Earth is compared with Uy Scutum, the difference is even greater. It would take 2 billion Earths to compare with it.
Why is Uy Scutum so huge? This is because it is a red supergiant star and is in the most massive stage of its final stage. In fact, its mass is not particularly large, about 32 times that of the sun. Therefore, the density of matter on Uy Scutum is very thin. The edge is much thinner than the air on Earth. In fact, our sun will also go through a stage like Uy Scutum in 5 to 7 billion years. At that time, the hydrogen fuel inside the sun will be exhausted in nuclear fusion, and the size of the sun will also expand violently after the helium flash phenomenon occurs. It will also become a red supergiant, and its volume will explode tens of millions of times compared to now. By then, its edge will also swallow up the orbit of our earth, and even advance to the vicinity of the orbit of Mars.
When the sun’s red supergiant phase ends, a white dwarf star will form in its core. When the red supergiant phase of uy Scutum ends, it will experience a supernova explosion and form a white dwarf star in its center. A black hole. Now Uy Scutum has reached the final stage of its main sequence. It can be said that it is about to become a black hole. After this change occurs, the diameter of this black hole will only be about ten kilometers at most. Compared with today's Scutum The size of Uy constellation is too small, but its mass is not small, at least three times the mass of the sun.
If UY Scutum replaced the sun, what kind of "sunrise" would we see on Earth?
The diameter of UY Scutum can reach approximately the orbit of Saturn. If the earth still maintains one astronomical unit, its apparent diameter can definitely reach a terrifying level. Almost 70% of the sky is covered by UY. How can it be achieved? What's the level of horror? I specially made a CAD drawing to simulate it:
UY can probably reach the orbit of Saturn. If Saturn’s radius is 1.43 billion kilometers and the earth is one astronomical unit away from its surface, then in What is the maximum viewing angle on Earth? The picture above has been marked, about 130 degrees, occupying more than 72 degrees of the sky. Perhaps the arc of the new "sun" in the rise is not obvious!
Of course, at this location, life no longer exists on the earth. As the earth rotates, it will be roasted on the outside and tender on the inside. Moreover, the orbits of other celestial bodies in the solar system will immediately become chaotic, and the celestial bodies in the Kuiper Belt will soon Disturbance caused by its gravity is captured by it. The heating of celestial bodies outside the orbit of Saturn is no small matter
Uranus has begun to glow faintly red
Neptune is also heated to a large extent
Even Pluto has begun to burn black
This is the true power of UY, and we do not welcome it!
UY Scutum is a red supergiant star that is much larger than the sun, with a radius as high as 7.94 astronomical units. If this giant star replaced the Sun, its outermost layers would be outside the orbit of Jupiter, and its five closest planets would be within it.
The distance between celestial bodies generally refers to the distance between the centers of mass of celestial bodies. Since UY Scutum is extremely large, if the earth is not swallowed by it, the distance between their centers of mass must at least exceed the radius of UY Scuti. radius, that is, more than 7.94 astronomical units. If we follow the assumption of the questioner, the star is still one astronomical unit away from us, we can only say that its surface is 1 astronomical unit away from the earth.
Through calculation, it can be seen that if UY Scutum is observed from such an Earth, the apparent diameter of this star will be as high as 125.3 degrees (the apparent diameter of the Sun is only 0.53 degrees), that is, almost half of the sky will be occupied by this star, and the maximum apparent area will account for 48.5 of the entire sky. Below is the scenario I simulated above using Universe Sandbox2:
In the simulation, the orbital radius of the Earth is set to 8.94 AU, so its surface distance from UY Scutum is 1 AU. It can be seen that UY Scutum is extremely huge, and the earth appears extremely small in front of it. In fact, even our sun is tiny in front of UY Scutum. Even though the surface of UY Scutum is 1 astronomical unit from the Earth, it still looks extremely large from the Earth.
In addition, according to simulation results, at such a close distance, the temperature of the earth's surface will be heated to 2056 degrees Celsius by UY Scutum, and the entire earth has been completely scorched. In addition, the orbital period of the Earth around UY Scutum will be as long as 9.17 years.
If we replaced the Sun with the largest star in the known universe, what would we see on Earth? ...First of all, you have to have an earth. However, the radius of UY Scutum is already eight times the distance between the sun and the earth. . . . So at this time the earth no longer exists.
This is the normal ratio of the Sun to the Earth:
The Earth is the tiny blue dot in the lower right corner. It looks like the earth is far away from the sun, right?
But what if the sun is replaced by UY Scutum, which is more than 1,700 times the size:
Its own radius is eight times the radius of the earth from the sun. The earth was swallowed directly.
The questioner asked in the question:
Sorry, it really covered the entire sky.
There is a vague point in the subject's description: it is one astronomical unit away from us.
If calculated according to the centroid distance, that is the above result.
If you think that this "distance" refers to the distance to the surface, the size will also be very huge. When we look at the sun, its opening angle is 0.009. And if it is UY Scutum, the angle will be 2.189. It is 463 times the visible radius of the sun! So, what you're looking at is a behemoth hundreds of times larger than the sun (actually 1,700 times bigger).
UY Scutum is a red supergiant and the largest star discovered so far. It takes more than 9 hours to orbit UY Scuti at the speed of light, while it only takes 14.5 seconds to orbit the sun. , calculations show that the volume of Uy Scuti is 4.5 billion times that of the sun and 2 billion times that of the Earth. Putting our sun on Uy Scuti is like throwing a sesame into the Pacific Ocean.
In the photo of Uy Scuti and the sun in the same frame, our sun does not even occupy a pixel size. Due to the huge size of Uy Scuti, if it is moved into the solar system, its diameter will be It will exceed the orbit of Jupiter and approach the orbit of Saturn. If the earth and other planets do not move a little farther out by then, we will not be able to see the sunrise of Uy Scutum, because at that time Mercury, Venus, Earth, Mars, Jupiter, their satellites, and the solar system The asteroid belt has been swallowed up by Uy Scutum.
So if we move the orbits of the planets in the solar system a certain distance outward to accommodate Uy Scuti, and do not consider the gravitational factor, the distance of the planets in the solar system to Uy Scuti is still the same as the distance from the sun before. Our earth will be 150 million kilometers away from Uy Scutum without considering gravitational factors.
Viewing the sunrise of Uy Scutum from the Earth will be a nightmare. At first, Uy Scuti will slowly reveal a very long arc on the horizon, and then it will slowly rise. , Uy Scutum can occupy more than 70% of the entire sky at noon, and you can’t see it when you go out. All you see is the boundless sea of ??flames. And due to the huge difference in the size of the earth and Uy Scutum, people’s sense of direction will be difficult to see at that time. The top and bottom of the center will be immediately reversed, and humans will feel like they are falling into the fire of Uy Scutum.
Answer: UY Scutum is a super-large red giant star currently discovered by humans; if it is placed next to the earth according to the title, then UY Scuti will occupy most of the daytime sky, and the earth’s surface temperature will be as high as thousands of degrees Celsius.
UY Scutum: 9,500 light-years away from the Earth, its mass is 32 times that of the Sun, its radius is 1,800~2,100 times that of the Sun (1800 is used in the following calculations), which is equivalent to ten times the Earth’s orbital radius, and its surface temperature is 3,100 , if placed at the position of the Sun, the surface of UY Scutum would extend into the orbit of Saturn.
If the Earth is placed one astronomical unit away from the surface of UY Scutum, we can calculate the angle of view of UY Scutum at this time:
sin (θ/2) = 12 /13.5;
θ 125 ;
In other words, when the Earth looks at UY Scutum, the angle of view is 125° (the angle of view of our sun is 0.5°), which almost occupies 70 sky.
Since the radius of UY Scutum is far more than one astronomical unit, the Earth at one astronomical unit is already close to the corona of UY Scutum. The solar wind will directly blow away the earth's atmosphere and then bake it directly. Earth's surface.
When a solar prominence event occurs, the solar prominences aroused by UY Scutum will directly sweep across the earth, with temperatures reaching hundreds of thousands of degrees Celsius, which can instantly vaporize any material on the earth.
Even if the earth is not vaporized, the orbit of the planet is unstable at such a short distance. Due to the resistance of the star's atmosphere, the planet will gradually slow down and then quickly fall into the star.
Planets in farther orbits will soon face tragedy, because UY Scuti is already in the final stage of a red giant, and the nuclear fusion reaction is gradually weakening; it is expected that in a few million years, it will It will end its stellar era in the form of a supernova explosion and transform into a black hole or neutron star.
If UY Scuti replaces the sun, in order to be able to see the sunrise, the earth must be moved to the orbit of Saturn, because in terms of the size of UY Scuti, its size will exceed the orbit of Jupiter and approach the orbit of Saturn.
UY Scuti is a red supergiant. Its current mass is 32 times that of the sun, but its diameter is more than 1,800 times that of the sun. If UY Scuti is compared to a large basket, the sun is larger than the sun. As a basketball, UY Scutum can hold 4.5 billion suns. Just imagine how big a basket that can hold 4.5 billion basketballs would be.
If the earth’s ecological environment remains undisturbed (mandatory condition), what kind of sunrise will we see on the earth?
When UY Scutum rises slowly, its boundaries can extend to the southernmost and northernmost ends of our sight, probably blocking less than half of the sky, because it is too bright to be visible. Identify exactly where its boundaries are. Of course, this is only in the morning. If it is 12 o'clock, then it is okay to cover the entire sky. The situation is probably like this:
According to the request of the subject, if the earth is one astronomical unit away from UY Scutum, , as far away from the sun as it is now. When it is fully raised, it will cover 70% of the sky from Earth.
(Imaginary picture, the real situation is bigger than this.)
My personal opinion, comments welcome!
This question is a bit puzzling.
Because UY Scutum is a late-life star that has left the main sequence, a so-called red supergiant. It is currently in an extremely unstable nova explosion stage. Its ultimate fate may be a neutron star or a compact neutron star.
Currently, the radius of UY Scutum is about 7.9 astronomical units. Jupiter is only 5.2 astronomical units from the sun, and Saturn is only 9.5 astronomical units.
In other words, if the sun is replaced by UY Scutum, all the inner planets, including Jupiter, will be swallowed by UY Scuti. This volume is much larger than the red giant that the Sun becomes after leaving the main sequence. Because by then, the radius of the sun will be only about one astronomical unit.
Although UY Scutum is large, its mass is only equivalent to 32 solar masses. It can be calculated from this that when UY Scuti is in the main sequence phase, its mass is approximately 36 solar masses. This mass exceeds that of most stars. It is also the largest among the blue giant stars.
If you simply replace UY Scutum with the sun in the main sequence period, there is no doubt that there is no life on the earth. In front of such a large star, the earth will not be burned. Even if you are lucky. The habitable zone of its star will be greatly moved back, at least in the orbit of Saturn. However, even if the earth is in the habitable zone, there is not enough time to breed life. Because the main sequence period of a star decreases sharply as its size and mass increases, compared to the 10-15 billion year main sequence life of yellow dwarfs such as the Sun, the main sequence period of a blue giant is usually less than 1 billion years. . Therefore, even if the earth is in the habitable zone of UY Scutum, it will not have time to breed life and will perish with the demise of UY Scutum.
In comparison, the earth, which revolves around the sun, is much luckier.
UY Scutum is the largest star known today. It is a red supergiant with a diameter of about 2.4 billion kilometers and about 16 astronomical units (the average distance between the sun and the earth).
The orbital radius of Jupiter is about 5.2 astronomical units, and the orbital radius of Saturn is about 9.6 astronomical units. So if UY Scuti is placed at the position of the sun, it will swallow up Mercury, Venus, Earth, Jupiter and approach the orbit of Saturn.
According to the description of weight, the temperature and gravitational effects are ignored, and it is assumed that the earth is one astronomical unit away from UY Scutum. It’s hard enough to see the “sunrise” of UY Scutum.
You will see that UY Scutum will occupy the distant horizon. As it rises, the blue sky and white clouds will become smaller and smaller, until it rises to the sky and will occupy the entire sky, only on the distant horizon. Leave some gaps.
It will take up 70 percent of the sky and will be visually terrifying.
In the past, some people often imagined that if Uy Scuti, the largest star in the universe, was moved to the position of the sun, what would happen to the earth? Can the sunrise be seen? Not only the world of Xingxing is also turbulent, one after another, the situation is changing. Now Uy Scutum has long since withdrawn from the world and has become an inconspicuous "star". Now the leading star in the world is a star called "Stevenson 2-18". When I hear this name, I am not sure. Instead of the earthy and earthy smell of Uy Scutum, a smell of foreign food came to my nose.
To know the details of Quli Baguai, please listen to the time and space communication.
Stars are huge compared to planets.
Stars are the most important celestial bodies in the universe, accounting for more than 90% of the matter in the visible universe. Compared with planets like the earth, stars are just giants. For example, in our solar system, the sun accounts for 99.86% of the total. The rest are all planets, dwarf planets, satellites, asteroids, comets, etc. added up. It occupies 0.14 of the solar system, and our earth in front of the sun is almost like the ratio of a mustard seed to a basketball, only one 330,000th of the sun's mass and one 130th of the sun's volume.
But among the stars in the universe, although the sun exceeds the mass of most dwarf planets, it is still a small hairy particle compared to large stars, and it is not as good as the earth and the sun. Uy Scutum, which has dominated the world for more than two hundred years, can kill the sun instantly. Uy Scutum is a red supergiant star that was cataloged by German astronomers at the Bonn Observatory in 1860. It was once considered the largest star in the universe, with a radius 1,708 times that of the sun.
Compared with Uy Scutum, the sun is not as good as a sesame seed next to a watermelon.
The radius of the sun is 696,000 km, 1708 times it is about 1.2 billion km, so the volume can almost accommodate 5 billion suns. The earth is only 1.3 million times the size of the sun, and the sun is only 5 billion times the size of Uy Scuti. This shows how pitiful our giant sun is in front of Uy Scuti. If Uy Scuti is a watermelon, then the sun will be You can't even see it next to it, and you can't even think of it as a sesame.
If uy Scutum is moved to the position of the sun, it will not only swallow up Mercury, Venus, Earth, Mars, and Jupiter, but may also scorch Saturn, because the average distance between Saturn and the sun is 1.4 billion kilometers, and the distance between Saturn and the sun is 1.4 billion kilometers. Only 1.35 billion kilometers at that time. At this time, the earth has already penetrated into the belly of Uy Scutum and turned into ashes. If its soul is still there, it is also more than 1 billion kilometers away from the surface of Uy Scutum. Still want to watch the sunrise? If you want to bubble up on the surface, it would take nearly 2 years for the bubble to reach the speed of 17km per second on Voyager 1.
However, you can enjoy the spectacular sunrise on Saturn at this time. The entire sky is covered by Uy Scutum, and the heat wave will quickly disperse the atmosphere of Saturn. If there is really life hiding there, there will be More or less dead, only when Saturn rotates away from this huge sun, the sun covering the entire sky can no longer be seen.
In fact, Uy Scutum is not that big, and it cannot be ranked at all now.
Current observations show that Uy Scuti is not that big. New data shows that it is only 755 times the radius of the sun, which is much smaller, and its volume is reduced to 430 million times the sun. . The radius of the sun is 696,000 kilometers, 755 times that is 525 million kilometers. Even if it is so small, the sunrise cannot be seen on the earth, because its radius still has to swallow up the earth and Mars, and it is only 253 million kilometers away from Jupiter. In this way, you cannot see the sunrise of Uy Scutum on the earth, but you can see the sunrise on Jupiter. What you see is a sunrise covering the sky.
Now the scientific community has discovered many stars that are 1,000 times larger than the radius of the sun, such as Betelgeuse, with a radius of about 700 to 1,000 times that of the sun; V Canis Major, with a radius of about 1,420 times that of the sun; Cygnus NML, with a radius of about 1640 times that of the sun; IRAS 05280-6910, with a radius of about 1260-1738 times of the sun; WOH G64 in the Large Magellanic Cloud, with a radius of about 1540 ~ 2575 times of the sun, etc. There are many more, so I won’t introduce them one by one. .
These stars are all super red giants, which are celestial bodies that expand at the end of stellar evolution. The sun will also follow this path 5 billion years later. However, because they are not as massive as these stars, there is no "super" Word, at best it will become a red giant star, with a radius about 200 times larger than today.
Therefore, if Uy Scutum is only 755 times the radius of the sun, it will no longer be ranked among large stars. The currently recognized largest star is a star called Stevenson 2-18, which is also a red supergiant and is also located in the constellation Scutum, about 20,000 light-years away from us. The radius of this star is 2150 to 2158 times that of the sun. What is the concept? That is, its volume is about 10 billion times that of the sun, and it can hold 130 billion earths.
What would the solar system look like if Stevenson 2-18 were at the position of the sun?
The radius of the sun is 696,000 km, 215.8 billion times is about 1.5 billion km. If Stevenson 2-18 was located at the position of the sun, Saturn would also be swallowed up, and only the two planets in the solar system, Uranus and Neptune, would survive. If you look at this "sun" from Uranus, you will see that most of the sky is covered by the sun. The heat wave will blow away the gas of Uranus, leaving behind a bare rocky core only the size of the Earth.
However, under the gravity of this huge "sun", Uranus and Neptune will be pulled close to its embrace and become members of its plasma. There are only two ways for them to survive, and one is to run faster. If the mass of Stevenson 2-18 is 10 times that of the sun, Uranus's revolution speed needs to be increased from the current 6.81km/s to 21km/s in order to compete with the gravity of Stevenson 2-18 and achieve a balance; One way is to stay away from it. But to get away, you need a faster speed, reaching an escape velocity of about 30km/s or more.
That’s it, discussion welcome, thanks for reading.