look up at the starry sky, for the most part we can see the stars are all stars like the sun, but these stars are different, they have a big and small, the volume and quality of quality small only 1/10 of the sun, there are one hundred times more than the sun, the biggest in more than 150 times, even if you look at them the volume, so the difference is bigger, has so far to find the smallest stars and Saturn volume, almost have not the size of Jupiter, but have found that the volume of the biggest stars by about ten billion times larger than the sun, such as the large dog VY UY, star and shield can hold billions of SUNS.
here in Canis major VY star as an example, the Canis major VY star how a star?It is a great dog red supergiant, about 5000 light years from earth, because of distance, it does not look bright, but in fact it's luminosity is 500000 times the mass of the sun, but astronomers estimate at its most bright period, its luminosity to the the sun 6.8 million times.
but this star is famous, is not because of its luminosity, but due to its huge body, scientists estimate by observing its volume is 70 to 10 billion times the sun, if the Canis major VY on the position of the sun, it will be over the edge of Saturn's orbit, which means it would take a short distance from the sun and the earth of basic water fire and earth of the six major planets all swallowed into the belly, but such a huge volume, but its quality is about 35 to 50 times that of the sun, so it's a very thin material density.And if the calculated formation age, the age of the even less than a fraction of the sun, astronomers estimate about its formation age between 300 to 4 million, and the life of the sun have LiuQiShiYiNian, and predicts Canis major vy life may be left with tens of thousands of years, is the red supergiant when it's at the end of the last stage, iron element in the center of it, it will be ended with a huge supernova explosion it as the main sequence star stage, then it will become a black hole.
if the Canis major vy instead of the sun, what happens in the solar system?Actually scenario is understandable, because of the big dog VY enormous physical, so the five major planets of basic water fire and earth and the earth, and all the small bodies in the asteroid belt, will be submerged in the open fire of the star.
so is not swallowed Uranus, Neptune and Pluto will be off the hook?Not, they can also be quickly buried at the star in the stomach, this is because the Canis major vy the star quality is too big, so it's gravity is much bigger than the sun, the sun if convert into it, gravity also jointly with the proportional increase, so, Uranus, Neptune, and Pluto and the kuiper belt objects that will be great dog attract vy and become a part of it.
so, if the Canis major VY instead of the sun, all in the solar system will be its immense gravity is clean, even though some distance especially distant objects can be escaped, so after tens of thousands of years, with the big dog VY destruction in the supernova explosion that object will be destroyed by it.
we are talk about Canis major VY supernova explosion in its own position, to see what would happen on the earth?Forecast in it after the outbreak of a year, he will be the brightest stars in the night sky, is brighter than Venus, under its glorious night reading books is not a problem, if not the gamma ray bursts of direct hit by it, the earth should not be adversely affected.