Is there a "wandering Earth" in the distant depths of the universe?
To try to find an answer to this question, more than 100 researchers from various Chinese institutes have participated in the Earth 2.0 project of the Chinese Academy of Sciences (CAS). They plan to conduct a "census" to search for Earth-like planets in the Milky Way.
Ge Jian, director of Earth 2.0 project of CAS, said the project aims to discover Earth-like planets in different orbits, including searching for another Earth-sized (0.8-1.25 times of the Earth's radius) planet in the habitable zone of sun-like stars.
In the past twenty years, the exoplanet research and relevant key technologies have become more developed.
Through combining transit methods and gravitational microlensing, the Earth 2.0 project will independently develop six 30cm telescopes of 500 square degrees and one 30cm telescope of 4 square degrees. By carrying these telescopes on satellites and using ultra-high-precision photometry, a large -scale searching of Earth-like planets is to be carried out.
According to Ge, the satellite team consisting of more than 200 astronomers from over 30 universities and research institutes at home and abroad has already completed the scientific objective research. Meanwhile, the team has also completed payload and ultra-high -precision guide star and satellite platform designs.
Two key technical problems of ultra-high stability control of satellite attitude and an ultra-high-precision CMOS photometric camera are still being tackled. The team has completed the ground test of the satellite flywheel isolation system and will carry out in-orbit verification in April.
Experts believe that the largest ever database of Earth-like planets will be obtained via Earth 2.0 project. Through in -depth analysis, researchers are expected to unveil the origin of Earth-like planets and other "wandering planets" in the Milky Way galaxy, pushing exoplanet science leap to the "Earth Age."