For more than half a century, we have been searching for radio signals from alien civilizations. But it's been, well, a little quiet. Do they ignore us? Or have aliens made contact without our knowledge? The truth can be hidden from everyone. How can technology help us find alien life? Could bacteria contain secret alien information? What if aliens are already living among us? Since the 1960s, SETI (Search for Extraterrestrial Civilization) scientists have been pointing their ears to the sky to listen for signals that can prove the existence of extraterrestrial life. Recently, strange and intermittent fast radio bursts have been discovered, originating in spiral galaxies like the Milky Way, 500 million light-years away from Earth. Some scientists want to know whether these pulsating signals from space are the result of miniature black holes, pulsars, or even extraterrestrial giant sutures. But are these signals really aliens trying to communicate with us? Harvard scientists speculate that the energy required to send radio signals to distant galaxies requires a planet twice the size of Earth to be covered in an energy harvester. Although this is possible, scientists have found an easier way for aliens to talk to us. According to Robert Zubrin, it may involve tiny interstellar candles. This idea has received enough support, and the Breakthrough Starshot project is studying nano-spacecraft. One day, they hope to transport them to Alpha Centauri. Although small spacecraft can fly long distances, bacteria can also survive the journey. This is because bacteria can easily replicate themselves. As microorganisms, they are small enough to overcome the gravitational pull of stars and enable them to travel through interstellar distances. Suppose a microbial nanoplane can be launched from Earth, flying one light year every 10,000 years. After 50,000 years, it can reach nearby stars. But why are aliens sending us bacteria? Well, the answer is in the DNA. Approximately 900 terabytes of DNA data can code for one gram (0.03 ounces) of bacteria. Imagine a 200-page book. Now imagine that there are 2 billion books. That is the amount of data. In fact, microbiologists believe that there may be extraterrestrial information hidden in Earth's DNA, waiting to be decoded. The researchers suggest that this information can be found by determining which bacteria can survive in space conditions. In fact, some astrobiologists on the International Space Station have conducted experiments to see if all life on Earth comes from extraterrestrial microorganisms. This theory, called Panspermia, suggests that microbes may have caught a comet that hit the earth. So, it's like ... maybe we are aliens. Wow! Too far, friend! Okay, okay, but are we really alone? Although microbial extraterrestrial information may exist, we are still not sure what these extraterrestrial messengers will look like. In general, we are familiar with life on Earth, where all living things are made up of cells that use molecular machinery. Since most life on earth is carbon-based, we may be looking for the wrong life. Many biochemists believe that silicon-based life forms may exist. In fact, some scientists, including British chemist and astronaut Helen Sharman, believe that aliens may exist in places that we cannot see or study, called the shadow biosphere. These invisible aliens can exist on a microscopic level that we cannot understand.
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