Can we immigrate to another planet?

We want to emigrate to another planet. What difficulties need to be overcome?

Obstacle 1: Find a livable planet first.

As a planet that can accept immigrants from the earth, besides water as the source of life and universal solvent, it also needs at least the following conditions:

The first is energy. The most obvious source of energy is the star of a planet or satellite. Taking the earth as an example, sunlight promotes the photosynthesis of plants, and the nutrients produced by photosynthesis can be directly or indirectly used as fuel by life on earth.

Second is time. Scientists believe that the stars of habitable planets need to exist for at least several billion years to have enough time for life to evolve. The earth is a good example. The earth is about 4.6 billion years old, and life has evolved at least 1 1 billion years.

In addition, if a planet can successfully breed life, it must have a crustal system suitable for molecular circulation, stable radiation from stars, and the existence of a magnetic field on the planet itself to protect life from charged particle storms.

Obstacle 2: How to get there?

According to the current speed of the space shuttle, it will take about 6.5438+0.5 million years to travel to a planet about 4 light years away from the Earth. If human beings want to immigrate to another planet, they must build a means of transportation at least as fast as the speed of light. It is reported that the US Air Force and NASA are currently secretly studying a "space engine" aircraft. Once the experiment is successful, it only takes 3 hours to get from the Earth to Mars and 80 days to the planet 1 1 light-year away.