Lead
In the universe billions of light-years away, human civilization has always seemed extremely small, but in the process of human consciousness and exploration, human beings have realized that they are not alone, and that there may be buildings of intelligent life within the galaxy alone.
And that's just the Milky Way, and now there are already some people who think that there are so many terrestrial planets that it is estimated that among these tens of billions of planets, the number of intelligent life structures is far greater than human imagination.
In the exploration of extraterrestrial civilizations, almost no one in the astronomical community believes that the signals of extraterrestrial civilizations do not exist, on the contrary, many astronomers and scientists believe that the signals of extraterrestrial civilizations have been received, but there are just not enough samples to decipher them.
In the discovery of terrestrial planets, astronomers also found a planet not far from us, which is 10 times heavier than the earth, and seems to be the local planet of the solar system, but astronomers believe that humans cannot live on this planet.
1. The discovery of terrestrial planets.
In the past, humans believed that the solar system was absolutely unique, but this different perception not only put humanity in an extremely awkward position, but also led to more speculation about extraterrestrial civilizations.
In the exploration of extraterrestrial intelligent life, astronomers have been doing their best, hoping to find their traces through the vast sea of stars.
In the past, the concept of terrestrial planets was thought to be the easiest place to exist near Mars, which is about the same mass and size, but such terrestrial planets not only need to maintain the right climate and temperature, but also need to have some magnetic shielding ability and suitable orbital position, so the number of such terrestrial planets is also small.
However, with the progress of astronomy, scientists have found that outside of Mars, near Saturn, Jupiter or in the asteroid belt, terrestrial planets with ice structures are more likely to occur, and they have a wider range of living conditions and potential life soils.
Among these naturally occurring terrestrial planets is the frequently referred to "HD69830D", which, as its name suggests, slowly orbits its parent star at a distance of 39 light-years from Earth.
Scientists are also quite excited about the discovery of "HD69830D", because the parent star HD69830 similar to the mass of the Sun, and it has three planets, which are numbered B, C, and D.
Among them, b and c are hot Jupiter, small Saturn, and d are terrestrial planets, which are not much different in size and mass from Earth, and astronomers quickly concluded that this planet is the most suitable distance from its parent star, and it is likely to be a terrestrial planet.
However, scientists do not agree with this, believing that the mass of this terrestrial planet is about five times heavier than that of Earth, and this is the most likely range of calculations, that is, the existence of terrestrial planets near this value is the most probable.
However, for the calculation of this mass range, scientists use the premise that there is no such thing as a terrestrial planet that is large or small, with surprisingly inclined orbits or too far off orbit, so the mass range that exists in the HD69830D is either very large or very small in terms of mass.
When astronomers made further observations of the HD69830D, the local giant planet did not show signs of its own in orbit, so scientists speculated that its mass was most likely heavy, and this range was likely to be twice that of the Earth, which seemed to be nothing special.
However, with the passage of time and the progress of science and technology, HD69830D also refocused on astronomers, who did not obtain new information when they made observations of the HD69830D, all because the HD69830D was too far away from the Earth and its brightness was low, so scientists could not observe it directly.
With the gradual improvement of scientists' technology, HD69830D was finally confirmed in 2008 under the alchemy of scientists that the mass of this tyrant planet is 10 times greater than that of the earth, and it weighs about 163 earths.
Using this as a reference, extrapolating the radius of the planet based on the mass of the Earth would be about 3.5 Earth radii, an unprecedented record in the history of astronomy.
However, it is denser than the Earth.
However, such gravity will cause the atmospheric pressure of the planet to rise sharply, and the air pressure will be as high as dozens of times that of the earth, so such a planet cannot breathe for external humans.
2. Alien civilizations spy on the Earth?
The study of this HD69830D has led some to speculate that such a large, shiny planet will attract the attention of extraterrestrial civilizations, and it is even believed that even its parent planet has been abducted by extraterrestrial civilizations one by one.
In the memory of mankind, from ancient times to the present, there are people who claim to have seen flying saucers, and these flying saucers have always built amazing mechanical devices around human beings since ancient times, so people soon thought that this must be the behavior of alien civilizations to spy on the earth.
The existence of HD69830D also makes many people think that the so-called alien civilization is not listening to the earth, but observing HD69830D, and even calls it "the monitoring equipment of the alien civilization near the planet".
However, this is only because the loss of HD69830D and the Earth is so significant that it suddenly becomes the focus of people's conjecture, but in fact, HD69830D as a planet, it will not be a place for alien civilizations to choose to observe just because it is too heavy to be inhabited by humans.
People's speculation about extraterrestrial civilizations has never stopped since ancient times, and with the completion of the last century, the rapid development of human science and technology has also made people's exploration of extraterrestrial civilizations more and more in-depth.
In this process, the definition of alien civilization has gradually become clear, and people believe that alien civilization must also have a civilization similar to human society, which not only has similar behaviors and customs to human beings, but also has a relatively mature system and system in the development of civilization.
3. Super-heavy terrestrial planets.
In the exploration of human beings, there is gradually a definition of terrestrial planets, these planets that are believed to be able to give birth to intelligent life, all have similar living conditions to the earth, but there are also great differences.
This discrepancy is likely to be encountered in almost every terrestrial planet discovery, such as in the HD69830D, although its gravity is not suitable for human life, there is also a "terrestrial planet" that lives in the habitable zone.
This planet is HD69830D, referred to as HD6930d, HD6930d, HD6930c, HD6930b, is a planet located in the belt, it is only 0.0633 AU away from its parent star, this number for HD6930d, represents the "habitable zone" in the eyes of human beings.
However, its distance from its parent star causes the radiation from its parent star to skyrocket, and if HD6930d had magnetic shielding ability, its surface temperature would be similar to that of Earth, but since HD6930d has no magnetic shielding ability, it has been lost in the harsh environment.
In the laser bullet of the parent star, HD6930d has been exposed to the sun for 200 million years, and in the course of these 200 million years, its geological activities have been carried out more than 45 times, HD6930d is like a demon in the eyes of humans, and its energy makes people stay away.
Under the gravity of HD6930d, its atmosphere has become extremely dense, on the whole, HD6930d is no longer suitable for human development and colonization, which is completely different from the previous image of HD6930d, so astronomers gave it a new title, called "super-heavy terrestrial planet".
HD6930d, just like its parent planet HD6930, seems to be a local tyrant, but it doesn't mean anything.
The gravity of HD6930d only allows creatures to live in a harsh environment, so humans should abandon exploring it.
At the same time as HD6930d was discovered, some people believed that extraterrestrial civilizations had been observing the Earth all along, and it never stopped.
epilogue
Indeed, in the process of human development, alien civilizations have always been mysterious existences, in ancient times, human beings once regarded alien civilizations as gods, and now, human beings believe that alien civilizations may believe in technology and rationality, and some people think that alien civilizations are not as good as human beings in their grasp of the universe, such a position is scientifically groundless.