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".
Category:
Science
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Science
Nuclear Fusion Ends At Iron, So Where Do Elements Heavier Than Iron In The Universe Come From?
The energy released by nuclear fusion is actually an important basis for stars to be able to maintain their stability
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Science
The Earth Has Mountains Over 8,000 Metres High And Ocean Trenches Over 10,000 Metres Deep, So Why Do Scientists Still Say The Earth Is Round
There is a view that the reason why the Earth looks round is because of the role of the Earth's oceans, which simply means that a large amount of seawater has "filled in" the undulations of the Earth's surface.
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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
There Is No Air In Space To Provide Reaction Forces, So Where Does The Power To Move The Spacecraft Forward Come From?
The law of conservation of momentum means that the total momentum of a system remains constant when it is not subject to external forces or when the sum of the vectors of external forces is zero
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Science
Life May Not Have Originated On Earth, And There Is Growing Evidence That Life Should Have Originated In Outer Space
In the past days, scientists have been working on the study of meteorites, and as the research continues, there is more and more evidence that life should originate from outer space
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In the evolutionary history of human beings, the gradual increase in brain volume is an important marker
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Everything we can see in the universe has an internal structure and they are all made up of smaller matter, so what is the smallest matter in the universe?
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In essence, sound is actually a wave generated by the vibration of the object, the sound waves in the air is actually a "longitudinal wave"
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Science
Once The World's Largest 'Eye In The Sky', It Sent Telegrams To Aliens, Now It's a Dumping Ground
The Arecibo Radio Telescope in the United States used to be the largest radio telescope in the world, with a diameter of 350 meters. As the most powerful radio telescope ever built, scientists have achieved many scientific results with the radio Arecibo radio telescope in the past decades