The most suitable star for size is a K-type main-sequence star, which is slightly smaller than the Sun.

They have a long period of stability of 10 billion, or even 20 billion years, and relatively balanced radiation levels.

In addition to size, the age of the star is also very important, it should not be too big, it should not be too small, and it needs to be a stable main-sequence star.

The juvenile and old age of a star is a time of continuous change in the state of the star, and the slightest change in the state of the star is a devastating disaster for the planets around her.

It is best for a galaxy to be a single star system, and if it is a double star system, there are certain requirements for the distance between the two stars.

The distance between the two stars should ideally be greater than 40 AU, so that the planet can orbit one star stably, and the other is less affected.

Either that, or close binary stars close to each other, so that planets can orbit two stars at the same time at a relatively long distance.

If the distance between the two stars is relatively moderate, the orbits of the planets in the habitable zone will be disturbed by the second star and will not be stable for a long time.

Of course, this long-term stability refers to the orbit of the entire star, like the sun, which is stable for the entire life of the star in billions or even tens of billions of years.

If the time range is shortened to 10 million years, as long as the habitable zone is not stuck in the gravitational equilibrium of the two stars, it can be considered stable.

Mu Feng's existing star database support, not to mention 10 million years, it is estimated that it will be able to develop to the level of dismantling stars in a thousand years, let alone adjusting the orbits of the planets.

At that time, all the stars will become natural energy storehouses, the more the merrier, and the stellar material of the parent galaxy will be used to retire.

So Mu Feng doesn't need to care too much about the number and distance of stars in the galaxy, as long as their positions are not too exaggerated.

According to such a standard, Mu Feng and Xingchen have conducted a preliminary screening of the stars around the sun before, and basically locked four conditions that meet the four conditions:

They are: Solar System, Tianyuan IV, Tiancang V, and South Gate II. The first three are all single stars, and the second one at the south gate is three stars.

Although Mu Feng instinctively wanted to take it all, he had to eat the meal one bite at a time, and now he had to choose a galaxy to dock first.

Take a look at the big picture of these galaxies.

Sun: About 4.6 billion years old, with a remaining main sequence of about 5 billion years, it has 4 rocky terrestrial planets, three in the habitable zone, 4 gaseous giant Jupiteriums, and two inner and outer asteroid belts.

The asteroid belt is a potential cosmic mineral base, but the solar system has formed too many planets, and most of the material in the galaxy is consumed, so the mass of the remaining asteroid belt is at a very low level in the single star system.

However, the low mass of the asteroid belt is also an advantage, and the probability of the inner planets being bombed by comets and asteroids is also very low.

Tianyuan 4: 0.8 times the mass of the sun, about 800 million years old, the remaining main sequence period is about 16 billion years, and it is a juvenile among stars.

The galaxy has a large, rocky planet that Earth's astronomers call SuperEarth, as well as two Jupiter-like gas giants, as well as two giant asteroid belts.

Because it is an early star, there is a large amount of leftover material around the Tianyuan, and the mass of the asteroid belt is more than 200 times that of the solar system, and the individual is larger than that of the solar system, and most of the asteroids are several times the diameter of the asteroid of the extinct dinosaur.

The probability of the inner planet being bombed by an asteroid is also more than 200 times that of the Earth, and disasters above the extinction level of the dinosaurs may occur one after another.

Because of its youth, Tianyuan Si is very active, and the intensity of ultraviolet rays, magnetic fields and X-ray radiation is more than 20 times that of the sun.

Tiancang 5: 0.78 times the mass of the sun, about 7.6 billion years old, the remaining main sequence period is about 8 billion years, with five terrestrial planets, all of which are larger than the Earth, and the two largest are located on the inner and outer edges of the habitable zone, with a large asteroid belt.

The total amount of material in the large-scale asteroid belt of Tiancang 5 is ten times that of the two asteroid belts of the solar system.

Although the early universe era was rich in resources, the probability of an inner planet being bombarded by an asteroid was more than ten times that of Earth.

Moreover, Tiancang 5 does not have a space defense array built by gas giants such as Jupiter, Saturn, Uranus, and Neptune in the solar system, so asteroids and meteorites will be very frequent, and it is difficult to evolve enough advanced life on its own.

However, because it is a mature middle-aged star, the Tiancang Five star itself is very stable, and the sunspot and flare activity are much lower than that of the sun.

South Gate 2A: 1.1 times the mass of the sun, age of about 4.6 billion years, the remaining main sequence period of about 30 years, no planets, no asteroid belt.

South Gate 2B: 0.9 times the mass of the sun, about 4.6 billion years old, more than 8 billion years of the remaining main sequence period, there is a terrestrial rocky planet, no asteroid belt.

South Gate 2 is a 2+1 triple star system, and the material in the galaxy is basically eaten by the two large stars inside, so there is no asteroid belt.

There is also only one planet, and it is too close to the star, only 0.04 AU, almost attached to the star, so it is a lava planet.

Taken together, none of these galaxies are perfect.

Although Tianyuan IV has a long remaining lifespan, it is too young, not mature and stable enough, and it has 20 times the radiation of the sun, and 200 times the probability of an asteroid impact in the solar system, which is prohibitive.

The solar system seems to be the best.

Most of the stars in the universe are multi-star systems, and single stars are relatively rare, and even fewer are habitable planets.

Moreover, single-star systems such as Tianyuan-4 and Tiancang-5 have abundant asteroid belts, and asteroids and comets are very active.

The sun is a single star, with a group of younger brothers, and a complete variety, with many rocky planets and many gas giants, so the asteroid belt is smaller in scope, and the material is relatively small, which is even rarer.

The problem is, the galaxy is now manned, and it's its own home.

If you drive the final fortress over now, the first thing to consider is where to stop.

In the vicinity of the Earth's orbit, a planet twice the size of the Earth suddenly appeared, which had a terrifying impact on the Earth.

Moreover, for advanced civilizations, stars are energy storehouses.

On the premise that the Earth is also his home planet, and on the premise that the final fortress can jump directly into a separate star system, there is no need for him to share a sun with his home planet.

On the other hand, after the fortress has gained a foothold in other galaxies, it will connect with the earth and guide the earth to unify and integrate into its own system, which is equivalent to having two initial galaxies.

As for the Tiancang Five, it is a similar situation, there are two rocky planets located in the habitable zone, both of which have the potential to become colonization stars in the future.

It is completely unnecessary to drive the final fortress directly over and share a star smaller than the sun with the two future colonies.

And here is also the same as other single-star systems, there are comets, meteors, and asteroids ten times larger than the Earth, the key is that there are no big brothers such as Jupiter, Saturn, Uranus, and Neptune to block the gun, and there are two in Tianyuan.

Once you've finally driven the fortress, you'll have to be ready to destroy the incoming asteroid in space.

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