If someone asks the question, are humans alone in the universe? I believe that most people would answer in the negative. In fact, the scientific community also generally agrees that there are a large number of intelligent civilisations in the vast universe, some of which may even be far ahead of our civilisation, and in order to better describe the technological level of intelligent civilisations in the universe, scientists have also proposed the concept of "Cosmic civilisation levels".
"universe"
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Extraterrestrial
Is The Sun Suspended In The Universe? What Exists Above And Below The Solar System?
Below the solar system, there is a star system labeled "alpha Centauri".
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Extraterrestrial
Mysterious Circles Have Appeared In The Universe And Scientists Don't Know How To Explain It... Is It The Emergence Of An Advanced Civilisation?
Whichever way you look at it, humans cannot be the only intelligent creatures in the universe. As far as we know, the universe has existed for at least tens of billions of years, so a reasonable speculation is that there is probably an advanced civilization in the universe that is hundreds of millions or even billions of years ahead of humans, and if that is the case, their level of technology is something that we humans simply cannot imagine.
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Between the Earth and the Moon there exists a much more empty space than imagined, so what can be put down in this space?
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A rigorous discussion of the unknown is not possible, so it is necessary to narrow down the universe we are discussing to only the universe we can see
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Extraterrestrial
There Is a Mysterious Force That Controls The Workings Of The Universe And About Which Mankind Knows Almost Nothing
Further research shows that this mysterious force accounts for 68.3% of the total mass energy of the universe, and it is because of this that it is able to overcome gravity and become the dominant force controlling the operation of the universe
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The reason we don't see time travelers is actually because they are not in our timeline
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Science
If Scientists Have Discovered Something That Shouldn't Have Existed Hundreds Of Millions Of Years Ago, Should Humanity Be Wary?
In theory, when a civilization develops into a civilization that can cross the stars, there is basically no risk of extinction
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Extraterrestrial
Would An Alien Civilisation Reveal Itself Voluntarily? 355 Light Years Away, An Abnormal Star Appears
Compared to radio messages sent by humans, this method seems to be more suitable for intelligent civilizations to announce their presence in the universe, because this method belongs to the "broadcast" in space, and intelligent civilizations in all directions can be observed
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Science
An Object From Outside The Solar System Crashed Into The Earth's Atmosphere In 2014, Research Suggests
NASA's Jet Propulsion Laboratory's Near Earth Object Research Center has such a database, which is called the "Fireball Database."