Don't panic: The world population is 7.8 billion, and scientists have determined that there are as many as 600 million livable planets in the Milky Way.

10 MSN reported on June 6 that according to the data analysis of NASA, there are about 300 million red dwarfs in the Milky Way. For red dwarfs, because their temperature and brightness are lower than the sun, it is easier to create conditions suitable for human habitation for the surrounding planets. At present, the world population is 7.8 billion.

Red dwarfs are quite common stars in the Milky Way, and the planets around these stars may belong to livable planets. Every red dwarf has two planets, which means that there may be as many as 600 million planets suitable for human habitation in the Milky Way. This may become a destination where human beings can migrate.

The biggest feature of a livable planet is that it is covered by clouds, which can adjust the temperature of the planet.

Scientists from NASA have spent nine years exploring extraterrestrial planets with Kepler telescope. Scientists all over the world are studying the data returned by Kepler telescope, and now they have found that there is liquid water on livable planets.

Many of these planets are our "interstellar neighbors", and the nearest one is about 20 light years away. Although the existence of liquid water does not necessarily mean that this planet can support human survival, the fact that there are so many planets with liquid water is still very exciting.

According to the statistics of NASA, there are about10 billion to 400 billion stars in the Milky Way, and each star has at least one planet, which means that there are trillions of planets in the Milky Way alone, of which only a few thousand can be directly observed by human technology.

The atmosphere and chemical composition of a planet determine whether it can give birth to life. In order to determine the livability index of the planet, scientists have also studied the following indicators.

First of all, it is necessary to observe whether there is really a sun-like star around this planet. Secondly, we should consider the distance between the planet and the star-too close will make the water on the surface of the planet evaporate, too far will make the water on the surface of the planet freeze.

In early years, scientists could not calculate the temperature and energy stored on these planets. Now, thanks to the data collected by the Gaia mission of the European Space Agency, scientists can incorporate factors such as temperature and energy into the analysis. At the same time, the Gaia mission also drew a three-dimensional map for the Milky Way.

In addition, scientists also said that about 7% of sun-like stars may have a world suitable for human survival, and some scientists estimate that this proportion may be as high as 75%. At present, the global population has reached 7.8 billion, and the United Nations predicts that it will reach11200 million by 2 100. If human beings can reach the technological level of interstellar travel in 80 years, maybe they can settle on other planets, and the world population pressure may be reduced a lot, so there is no need to panic now. Not long ago, elon musk, the realistic version of Iron Man in the United States, announced that Mars did not apply the laws of the earth and was accused of wanting to be the "President of Mars". This prospect may be very close to reality.