The Search For Extraterrestrial Intelligence Turns Out Null
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The G-HAT study used data from the WISE telescope to search for signs of intelligent life by looking for waste heat signatures from advanced civilizations. The study analyzed thermal images of galaxies to classify civilizations based on their efficiency in using captured starlight. However, the preliminary search of nearby regions of the universe found no evidence of galaxy-spanning civilizations, suggesting humans may be the only intelligent life in our local area. Further studies may expand the search area and look for less advanced civilizations.
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3. Kepler-186f, an Earth-sized exoplanet discovered in the habitable zone of its star, is particularly notable as it is the smallest exoplanet found so far to orbit in the habitable zone where liquid water could exist.
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The Search For Extraterrestrial Intelligence Turns Out Null
- 1. The Search For Extraterrestrial Intelligence Turns Out Null. Where are all the aliens? A new study indicates that humans might be the sole form of intelligent life in the nearby universe. The new study, dubbed Glimpsing Heat from Alien Technologies, or G- HAT, is entering the search for extraterrestrial intelligence. The study aims to seek out intelligent civilizations by searching for alien waste-heat. The scientists begin their search while operating under the definition of intelligent life as life which uses energy and engineering in order to overcome its limited resources. The researchers use data from the 2009 Wide-Field Infrared Explorer (WISE), which provides thermal images of the Milky Way galaxy along with a million other galaxies. This data enables the G-HAT team to peak into foreign environments and perhaps observe the life by which these environments are populated. Any particular galaxy may contain a varied number of stars, planets, and civilizations. In our own planetary system, which is part of the Milky Way galaxy, Earth maintains an elliptical orbit about its host star, the Sun. Light from the Sun falls on planet Earth and humans engineer methods which enable them to harvest that energy for their own purposes. It is highly probable that any sufficiently advanced civilization does the same. The first law of thermodynamics is a statement of energy conservation. This law indicates that the energy that comes in is equal to the energy which goes out. In the case of a planet intercepting energy as a portion of its host star’s light, that energy must be reradiated by the planet, primarily as heat. The thermal imagery provided by WISE depicts the energy radiated by a star or planet. The relative brightness between a planet and its host star can therefore indicate the efficiency with which the planet’s inhabitants might be using their star’s energy. A highly efficient system could be indicative of advanced engineering and intelligent life. The G-HAT team is analyzing this data by classifying civilizations based on the power of their intercepted starlight, non-starlight energy, reradiated heat, and non-thermal waste disposal. The preliminary search for intelligent life in the neighboring sectors of our universe has turned up null. Results show that waste heat profiles characteristic of galaxy spanning civilizations are highly unlikely.
- 2. Further studies using the waste heat approach might include the search for less advanced civilizations or the expansion of the search to include a larger fraction of the universe. Additionally, Communication and Artifact SETI will remain pursuant in their search for radio communication from extraterrestrial intelligence and environmental evidence of an extraterrestrial civilization’s existence, respectively. The scientists will continue to push forward the frontiers of our knowledge, but for now, however, our questions remain unanswered. Life everywhere must continue to wonder, "Is anybody out there?".