Scientists have long begun the journey of finding extraterrestrial life. There are several planets in the solar system that may support the existence of life. Scientists believe that ancient Mars has a liquid water environment, so life is likely to exist. All we have to do is to discover these traces of life. But there are also scientists who put their vision outside the solar system, use data from the exoplanet probe to discover planets outside the solar system, and use spectral analysis techniques to find signals of the existence of extrasolar life.
Traditional spectroscopic analysis can detect the atmospheric environment of exoplanets. If there is liquid water on exoplanets, then its spectrum will be different. Examination methods for exoplanets, such as the transit method, can help to find exoplanets. The mystery of the composition of the atmosphere on the planet. But recently, astronomer Amit Misra of the University of Washington and his colleagues announced a new method of investigation. The technique relies on a substance called "dimer". The investigation technique is based on the exoplanet. Atmospheric molecules, through this method, scientists can discover whether substances such as oxygen exist in the atmosphere of exoplanets.
When a planet passes through its stellar disc surface, the stellar light will pass through its atmosphere and propagate in the vast universe until it is captured by our telescope. A special device can be installed on the filter to investigate a specific For the characteristics of dimers, the survey object currently set by scientists is oxygen. There is an astrobiologist in Misra ’s research team. His task is to find oxygen-based alien creatures. If scientists observe a planet with a strong oxygen dimer signal, then it means that the planet Oxygen exists in the atmosphere above, it is very likely that there are photosynthetic organisms.
However, this method also has its limitations and requires new telescope technology to support it. Currently, NASA ’s most advanced telescope is the Hubble Space Telescope. Its successor, James Webb Space Telescope, will be launched in October 2018 to replace Harbin. We will acquire more powerful observation capabilities at that time, and we can collect the spectral data of distant stars and their planetary systems, which has very positive significance for the investigation of life outside the system.
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