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Interesting theories about the possibility of aliens

Technological advances help us discover more about the Solar System and the Milky Way. The more we understand about the universe, the more we want to know if there is life out there similar to Earth.

We, humans, are always curious about our own existence and the world around us. As we learn more about the universe in which we live, we feel an urge to seek answers to the question, are we alone in this universe?
We, humans, are always curious about our own existence and the world around us. As we learn more about the universe in which we live, we feel an urge to seek answers to the question, are we alone in this universe?

Many projects have existed over the past decades to search for intelligent life in the universe, but we have yet to communicate with anything or anyone.
Many projects have existed over the past decades to search for intelligent life in the universe, but we have yet to communicate with anything or anyone.

Fermi Paradox: Italian-American physicist Enrico Fermi in the early 20th century formulated a paradox that is still famous today about extraterrestrial life. Accordingly, this paradox is the stark contrast between high estimates of the possibility of extraterrestrial civilizations and the lack of evidence or connection to such civilizations.
Fermi Paradox: Italian-American physicist Enrico Fermi in the early 20th century formulated a paradox that is still famous today about extraterrestrial life. Accordingly, this paradox is the stark contrast between high estimates of the possibility of extraterrestrial civilizations and the lack of evidence or connection to such civilizations.

Our galaxy alone has 100-400 billion stars, many of which are likely to have planets orbiting them. Astronomers think there could be billions of planets in the habitable zone around its stars in the Milky Way. That means they have the necessary conditions for life to exist.
Our galaxy alone has 100-400 billion stars, many of which are likely to have planets orbiting them. Astronomers think there could be billions of planets in the habitable zone around its stars in the Milky Way. That means they have the necessary conditions for life to exist.

Organizations such as NASA, the European Space Agency, and the Search for Intelligent Extraterrestrial Life have launched many projects to search for stars with signs of life.
Organizations such as NASA, the European Space Agency, and the Search for Intelligent Extraterrestrial Life have launched many projects to search for stars with signs of life.

Huge radio antennas and telescopes were used to send and listen to radio signals that could be transmitted. Other methods are also used. However, there are problems with using radio frequencies to determine whether intelligent life exists beyond Earth.
Huge radio antennas and telescopes were used to send and listen to radio signals that could be transmitted. Other methods are also used. However, there are problems with using radio frequencies to determine whether intelligent life exists beyond Earth.

This problem includes not having enough technology to understand the signals being transmitted by other intelligent life forms, simply because they are not transmitted directly to us or are located too far away, and that means the signs still not reaching us.
This problem includes not having enough technology to understand the signals being transmitted by other intelligent life forms, simply because they are not transmitted directly to us or are located too far away, and that means the signs still not reaching us.

We have been listening to radio frequencies for more than a century, and we have yet to receive a signal from any intelligent life located more than 100 light-years from Earth.
We have been listening to radio frequencies for more than a century, and we have yet to receive a signal from any intelligent life located more than 100 light-years from Earth.

The Great Filter Theory: This theory refers to an event that prevents civilization from reaching the level of technological advancement required for interplanetary travel or communication. Accordingly, each organism, no matter how developed, will at some point fail and cannot become a space travel civilization.

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