Shulou(Shulou.com)11/24 Report--

"the universe is vast and the years are long, and I am always willing to tell you stories about this universe."

Cosmic scale and age mean that higher civilization should exist.

However, this hypothesis is not supported by sufficient evidence.

Fermi paradox

Physicist Fermi and his colleagues said at a dinner that since the universe is so vast, the possibility of extraterrestrial life is high in terms of the number of existing stars and planets, but why didn't we find them?

This is the famous Fermi paradox, and there has been no evidence of the existence of alien civilizations for many years. One of the hypotheses, the "Great filter", is that the technological development of a civilization will inevitably herald the destruction of the civilization itself. whenever the technology of a civilization develops to a certain extent (when it can send signals to the universe and spaceships to other planets), the technology of this civilization is mature enough to destroy itself. The specific causes of destruction may be climate change, nuclear war, biological war or chemical war.

If human civilization comes to an end in the near future, then our extraterrestrial radio signals and starships will become evidence of human existence, similar to the discovery of dinosaur bones.

There are about 100 billion stars in our Milky way galaxy, and even more if intelligent life lives on planets. We have always been willing to believe that we are not the only civilization in this universe.

Human beings use local observatories to receive electromagnetic waves from the universe and analyze regular signals in order to discover alien civilizations. This non-profit organization is called SETI,SETI@home and announces its volunteer program after its official operation. Volunteers can use the spare time of their computers to receive and automatically analyze data from telescopes, which is the coolest thing that ordinary people's computers can do. Unfortunately, the project was forced to stop in 2005 because of funding problems.

Although many scientists believe that we should not take the initiative to look for extraterrestrials, they are still unable to stop human curiosity, let alone accept the fact that human beings are alone in the universe. Human beings are not willing to passively accept signals from other civilizations. Instead, they actively send powerful signals to nearby stars, hoping to get a reply.

Arecibo information

Sending a binary radio message to the globular cluster (M13) 25000 light-years from Earth, written by Drake and Karl Sagan, contains 1679 binary digits and arranges the signals to show what the following image looks like, showing the atomic number, human DNA, height and the number of the world's population at that time, the solar system and planets, and the telescope that sent the radio message. Hawking thinks it's too dangerous for humans to do this, but if M13 is really civilized, it will be 50, 000 years before they decode it and call back to Earth.

Two Japanese astronomers sent radio signals from Stanford University's laboratory to Hegu er, which was launched in 1983 and arrived in 1999.

Milstone radar messages sent recordings to four stars, including Tianyuan IV and Tiancang 5, which arrived in 2020, showing details of human genitals, which were halted a few minutes after launch.

The call of the Universe in 1999 and 2003, some text, images, music and video were sent to nine sun-like stars, 30-70 light-years away, and the information was designed in the form of noise barrier, so that they will not be disturbed by noise during transmission.

The teenager's message sent a 14-minute Taylor Ming electronic organ concert and audio, images and text selected by a group of Russian teenagers to six sun-like stars, which were launched in 2001. arrived in 2047, 2057, 2057, 2059, 2070, respectively.

Craig's list sent 130000 posts on the site (craigslist.org) to the vast expanse of space, which was launched in 2005, and there was no specific time of arrival because there was no setting on which planet to arrive.

NASA Universe sent 501 messages from the social networking site Bebo to a super-Earth 20 light-years away in Gliese 581c in 2008.

In the same year, NASA sent the Beatles song "across the Universe" to Polaris.

Earth's greetings sent 25880 text messages in 2009 to an exoplanet 20 light-years away (Gliese 581d), eight times the mass of Earth, and the message has not yet arrived.

In the same year, the genetic code for the carboxylase Ru-BisCo needed for plant photosynthesis was sent to Tigaden, GJ83.1 and Cetaceus K1, which arrived in 2021, 2024 and 2039, respectively.

Restore "Wow! signal" one night in July 1977, a SETI volunteer found an abnormal signal, converted the signal into letters, and obtained the "Wow" signal. According to the measurement and location, it was determined that the source of the signal was in the direction of Sagittarius. In the decades that followed, astronomers sent similar signals many times, but did not receive the same information again. Until 2012, when the signal began to be restored, the Arecibo Observatory asked "Wow!" at the request of the National Geographic Channel. The direction of the signal emits a beam of radio waves containing 10000 Twitter messages.

Loneliness signal loneliness signals are scientists who actively send messages to space instead of passively waiting for extraterrestrials to broadcast. On the site, anyone is also accepted to pay to customize their own signal and send it to space, which costs about $20, and the project was forced to stop shortly after it started due to lack of funds.

In addition to the above signals sent into space, humans have also launched several probes, Pioneer 10 and 11, depicting the position of Earth in the Milky way and the physical characteristics of humans; and the spacecraft Voyager 1 and 2, which are currently the furthest from us.

"the most moving thing in the world is the distant similarity."

We never stop looking. Maybe in those distant and strange corners of the universe, life is looking up at us for hundreds of millions of light-years.

This article comes from the official account of Wechat: dark Energy Universe (ID:darkenergy4038), author: the wave function of Miss Cat.

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