What wonders will happen when a matter sun and an antimatter sun collide?

This is an answer to a question invited by netizens. The original question is: What wonders will happen if a positive matter sun and an antimatter sun collide head-on at a high enough speed?

When matter and antimatter meet, no matter it is the so-called "collision" or a gentle "meeting", there is only one result, which is annihilation. At the same time, all the energy of the mass of the matter is released, including the energy of the sum of the masses of the interacting matter and antimatter. This energy can be simply calculated using Einstein's mass-energy equation, that is: E=MC^2, that is, energy is equal to the product of mass and the speed of light squared. The unit of mass is kilogram (kg) and the unit of speed of light is meter (m).

When a positive matter sun collides with an antimatter sun, whether it is a head-on collision, a back-on collision, a side collision, a top-down collision, or a bottom-down collision, the result is the same: instant annihilation and the release of energy of two solar masses.

How big is this energy? The mass of the sun is about 2*10^30kg, and the energy of two suns annihilating each other is: 2(2*10^30)*300000000^2≈3.6*10^47J (joules). How big is this energy? That is 11 orders of magnitude greater than the total energy emitted by the Milky Way, or 100 billion times.

This kind of energy is incomparable on Earth. If we must make a more vivid comparison, it is equivalent to the energy of 8.6*10^37 tons of TNT explosives. To be more specific, it is equivalent to the energy of 8.6*10^30 (100 trillion trillion trillion) 10 million ton hydrogen bombs exploding at the same time.

This kind of energy is also extremely rare in the universe. The energy of a supernova explosion is about 10^44J, which is already very amazing, but the energy of two suns annihilating each other is 1,000 times greater than that of a supernova explosion. The energy radiation of a supernova explosion will eliminate the life in the surrounding celestial bodies within dozens of light years, and the energy of two suns annihilating each other will kill the life in the surrounding hundreds of light years.

Some people may ask, if two antimatter particles with the mass of the sun collide and annihilate, will the Milky Way be destroyed? This seems to underestimate the Milky Way. You know, the radius of the Milky Way is 100,000 light years, which means that if an explosion occurs at the center of the Milky Way, it will take 100,000 years for the energy to spread throughout the Milky Way at the speed of light. Besides, except for light radiation, the shock wave of any explosion cannot reach the speed of light. The shock wave of the fastest supernova explosion is only 10% to 20% of the speed of light.

Some people say that it takes at least 10^52J of energy to destroy the Milky Way. I don't know what the basis for this is or how it was calculated. If this amount of energy can really destroy the Milky Way, then it is equivalent to the energy of annihilating 100,000 matter suns and 100,000 antimatter suns at the same time.

If there is a spectacle, it is an energy explosion, which is brighter than a supernova. However, unlike a supernova explosion, which has a long dissipation process, the matter after the explosion gradually cools and disperses, and remains in space; while annihilation will disappear in an instant, emitting only a dazzling light for a moment and then disappearing without a trace, as if it had never appeared in the first place.

Of course, the premise of all these observations is that the explosion occurs at a distance of at least 100 light years away. If it is too close, humans as observers will also die, and life will disappear from the earth.

This is just my personal opinion, welcome to discuss.

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