The position of the largest known star in the sky

The largest star known today is Vv A in the constellation Cepheus, please check it out in my photo album

The constellation Cepheus is a winter constellation, and in October or November each year, the constellation Cepheus is in the northeast sky, so the largest star known is in the northeast sky during winter.

Note: Although VV A is the largest known star, it is so far away from us that it has a small apparent magnitude and is invisible to the naked eye).

The star with the largest apparent diameter (not counting the Sun) is Aldebaran (Taurus A), 68 light-years from Earth, and an orange giant star (with a radius about the same as the orbit of Mars), so it ranks first among all stars in apparent diameter, but a little calculation can conclude that its apparent diameter is still very small, about 1 6000 arc seconds (1 6000 of the limit of the resolution of the naked eye).

If the landlord asks about the actual volume, then I'm afraid no one can give you an answer, and no one dares to guarantee that there is a supergiant star with the size of a giant star in that extragalactic galaxy (the telescope can't tell it yet), so if someone can hug the star with the actual volume, I personally think it's not very rigorous.

The biggest star? Now it seems impossible to do so. Because they can't tell. It seems that it can only be said that the stars that cannot be distinguished by the "pile" are larger, and the stars that cannot be distinguished by the other "pile" are smaller. Just "heap" big! "Heap" small!

The biggest star? If you ask about the largest "star", it is impossible to know because it is impossible to distinguish. Humanity is to the extraterrestrial, to the universe, not as good as an electron to the Earth.

The biggest star is the red giant!

01 Yes. Because the speed and direction of the movement of the stars of the same source are different, their relative positions in the coarse universe will change accordingly, and scientists call this change the star's self.

Although stars are extremely stable, their position in the sky is not eternal. As philosophy says, everything in the world is in motion, and the stars are hail like potatoes. However, because different stars move at different speeds and directions, their relative positions in the universe will change accordingly, and scientists call this change the star's own.

Among the stars we humans have observed, including those that are simply invisible to the naked eye, the fastest on their own is Barnard's Star.

The distance of the star on its own is not the same as the real speed of the star's motion. Even at the same speed, distance will look slow, while close distance will look fast. In addition, the star is also moving continuously in the direction of our line of sight, which is called the apparent motion.

The spatial motion of stars can be divided into three parts, the first part is the circular motion of the star around the center of the Milky Way, the second is the reflection of the sun's participation in the movement of the Milky Way, and the third is the movement of the star itself. So, the position of stars in the sky is not set in stone.

Which is the largest star and the smallest planet? The largest star we all know is made of a giant shield uy, the aperture of this planet reaches the periphery of Jupiter's orbit, you should know that Jupiter is outside the astronomical unit of sunlight, an astronomical unit is about 100 million kilometers, and the astronomical unit is 100 million kilometers, in other words, the caliber of the constellation Shield is an unprecedented 100 million kilometers! But Uy is a big fat man, with a mass of about 10 times that of the sun, and only the violent combustion of helium in the internal structure has swelled into a red giant!

The smallest star is OGLE-TR-122 B, which has an aperture of only 100 million kilometers, which is a little larger than Jupiter's 100 million kilometers, but it has reached the level of a planet, successfully breaking away from the ranks of brown dwarfs and entering the lower red dwarfs of the planet!

How do you become a planet? Perhaps it is the dream of all stars to become a star, but stars are made by thresholds, and the rules are very simple, and the only criterion is quality! Because if you want hydrogen to fission, you must have enough attraction to collapse the ambient temperature of the core of the star before it can ignite, otherwise it will be a gas giant!

For example, Jupiter is a failed planet, and its minimum distance between brown dwarfs (hydrogen isotope deuterium fission) is still 12 times its own quality, but in fact, brown dwarfs cannot reach the planet's coding sequence, and the fission of hydrogen isotope deuterium, which needs to reach 80-100 times the mass of Jupiter, is a long-lived red dwarf!

Proxima Centauri, the closest planet to the planets of the solar system, is a red dwarf, which is about 125 times the mass of Jupiter! Don't underestimate its small mass, but it has a lifetime of hundreds of millions of light-years, because red dwarfs with a mass of less than 80% of the solar mass have no radiation layer protection, and every hydrogen element can circulate the system to the core to participate in controlled nuclear fusion, so the service life reaches a shocking level! In fact, it is not difficult to see that the hydrogen of other planets is extremely wasteful!

But it has given countless opportunities to large planets, and without the violent combustion of helium, there would be no red giant period, there would be no supernova explosion period, and it is impossible for a large planet to develop a life!

Where is the upper limit of the planet? Will there also be infinite planets? This is indeed a difficult problem, the mass of the Uy of the constellation Shield that you have observed is about 10 times that of the Sun, but it has surged to the periphery of Jupiter's orbit, so the key R136A1 of the Spider Orbit R136 star cluster of the Magellanic Galaxy, this is the largest star we have observed, reaching 256 times that of the Sun, so will its red giant period be larger than all the planets of the solar system?

The Herault diagram, which mainly represents the size and evolution of the planets and their duration, we can understand that the supergiant star in the upper left and its blue supergiant cannot develop into a red giant, for example, the future horoscope of R136A1 may directly end its short life with a supernova of type or type b or c!

The smallest star with the mass of the Sun and the largest is 265 times the mass of the Sun, which is the result of scientists' research.

The smallest core is a kilometer, and the largest is more than 30 billion kilometers, and the role of stars in the universe is very large.

The minimum mass of a star depends on the temperature at which it can initiate fusion of protons inside, and when it is less than a multiple of the mass of the Sun, only brown dwarfs can form, not stars. The maximum mass of a star depends on the tipping point at which the star can maintain a stable external form. Theoretically, when it exceeds the Eddington limit, which is 150 times the mass of the Sun, the star will be very unstable and have a tendency to disintegrate.