The universe is vast, with countless stars and planets. The earth is one of the eight planets in the solar system, and it is also the only intelligent life planet known by human beings. So are there earth like planets that are very similar to the earth outside the solar system? The answer is yes.
After human stepped out of the earth and began to explore the universe, it has become an important and arduous task to find extrasolar planets. If we want to find extrasolar planets, we can not do without a powerful tool: astronomical telescope. Before the speed of human spaceship has achieved a qualitative leap, we can only rely on astronomical telescope to find and explore extrasolar planets.
With the help of astronomical telescopes, scientists have found many earth like planets outside the solar system, some of which are very similar to the earth, so it is not ruled out that they are suitable for human survival. Recently, scientists have discovered a new earth like planet, HD 21749b, which is classified as the so-called “sub Neptune” exoplanet, meaning that its mass is smaller than Uranus or Neptune.
This planet was discovered by a new space telescope launched by NASA last year. This telescope is called “Tess”, which is transliterated as “Tess”. This earth like planet is also the first earth sized exoplanet discovered by Tess.
The planet is about 53 light-years away from the earth. Its diameter is about 2.7 times that of the earth, and its mass is about 23 times that of the earth. Through observation, scientists believe that it may have a relatively thick atmosphere. Its orbit around the star is relatively short, only 36 days. According to preliminary exploration, the newly discovered planet may not be completely rocky, and its atmosphere may have a lower temperature.
This is just a preliminary discovery since Tess’s work. In the future, it will find more exoplanets, among which there may be planets suitable for human survival. In fact, the main way for scientists to search for exoplanets is to look for Stars first. Because stars are the bright lights of the universe, they can emit intense light and heat under the action of nuclear fusion reaction.
In the universe, a star is a headlight, and it is also a relatively easy to detect celestial body. After the discovery of a star, there will probably be planets around the star. For example, there are eight planets around the star. Because of its large mass and strong gravity, stars can easily attract some planets to revolve around them.
Therefore, there may be different number of planets around each star. Therefore, scientists search for the existence of planets through astronomical telescopes. First of all, they search for stars, and then look around stars to detect whether there are planets. Most earth like planets are discovered through this method. In the Milky way, there are hundreds of billions of stars, so the number of planets is too many to estimate, and there may be many green planets suitable for survival.
In addition to the interest of exploration and research, the reason why human beings explore and search for extraterrestrial planets is more important for the future of human beings. As we all know, due to the rapid development of human science and technology and the emission of a large number of pollutants, the earth’s ecological system has begun to deteriorate step by step. Compared with 50 years ago, the earth’s ecological environment has undergone tremendous changes, and this trend of environmental deterioration continues.
In addition to the deterioration of the ecological environment, the rapid development of human science and technology is also accelerating the consumption of the earth’s resources. Therefore, sooner or later, the earth will no longer be suitable for human survival. If human civilization wants to continue, it is a high probability event to emigrate to the planet. If human beings want to immigrate to other planets in the future, they first need to find a new earth suitable for human survival.
According to the exploration of scientists, there is no second natural planet in the solar system that is suitable for human survival except earth. Although scientists regard Mars as the future migration planet of human beings, Mars still needs to undergo a series of transformation if it wants to be suitable for human survival, but whether the transformation can be successful is unknown. So scientists are looking beyond the vast solar system.
There are countless planets in the galaxy, and there are also many earth like planets similar to the earth. It’s not surprising that there may be planets like the earth that are suitable for human survival. However, due to the limitation of human science and technology, we can’t reach the earth like planets that are too far away from the solar system. If human beings want to immigrate in the future, they can only explore and find a new earth near the solar system. In this way, when human beings realize sub light speed flight in the future, it is possible to realize the dream of immigrating to other planets.
Of course, if human beings can fly faster than light in the future, the scope of exploration will be wider. At that time, human beings will no longer worry about immigrating to other planets, human steps will also be able to travel to every corner of the galaxy, there will be many colonized planets, and human civilization will become a real interstellar civilization.
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