Write a composition of 100 words about "immigration to space"

If the end of the world really comes in 20 12, what will mankind do? As Stephen Hawking, a British theoretical physicist, warned, if mankind cannot emigrate to outer space in the next two centuries, it will be extinct forever. The only chance for mankind to survive for a long time is to move away from the earth. Living on another planet. Hawking said: "The genetic code of human beings carries selfish and aggressive instinct, which used to be the advantage of survival, but it is difficult for human beings to avoid disaster in the future 100, let alone in the future 1000 or1000."

When it comes to immigration, Mars has always been the best choice. Because Mars is not only the closest exoplanet to the earth, but also the closest natural environment to the earth: Mars has an atmosphere and seasonal changes. There are signs of liquid water on the surface of Mars, which is an essential element for the origin of life. Although there is no oxygen on Mars, the temperature is extremely low and the radiation is large, scientists envisage using cutting-edge technology to transform the gas composition of Mars to make it suitable for human habitation. Some optimists believe that it may take hundreds of years to green Mars with the existing technology, and then humans can live with special breathing devices.

Besides Mars, we can also choose Gliese 58 1c planet, which is 1.5 times the diameter of the earth, with a surface temperature of about 0-40℃ and possibly liquid water on the surface. Because these conditions are similar to the earth, this new star is praised as a "livable planet" by scientists.

Humans moved, and so did the animal and plant brothers. The United States "Alliance for Saving Civilization" plans to establish a "backup database" of biological DNA on the moon. This backup database contains not only the DNA of all animals and plants, but also the DNA of all races on the earth. In addition, an "ultimate library" will be built in the library to preserve all the knowledge of human civilization. If one day, life on the earth is destroyed, we can use the existing DNA to rebuild our homes on other planets.

Found a "new home", but how are we going to move there? Hawking's theory of "time travel" may help us find the Ark in the time tunnel, a tunnel leading to other planets.

Time tunnel is also a wormhole. Hawking said that the wormhole is around us, but it is too small to be seen by the naked eye. Everything in the universe has holes or cracks, and this basic law also applies to time. Time also has tiny cracks and gaps. The gap smaller than that between molecules and atoms is called "quantum bubble", and wormholes exist in "quantum bubble". Passing through the wormhole is equivalent to using time and entering the time tunnel.

Time is like a river. Different sections have different velocities, some are slower and some are faster, which is the key to the future. A supermassive black hole heavier than the whole galaxy can significantly slow down the time. Hawking said that this supermassive black hole is like a natural time machine. If a spaceship enters a super-large black hole for a five-year mission, it will find that 10 years have passed when it returns to Earth. If humans can make good use of this time difference, then "time travel" is not just a dream.

If we can build a spacecraft with a speed close to the speed of light, then the time of the spacecraft in the cabin will inevitably slow down, because it cannot violate the law of the fastest speed of light. In this way, the astronauts flew for a week, and the time on the earth has passed 100 years, thus realizing the journey in the future.