Whereas F-type stars (yellow-white dwarfs) are hotter, brighter, and more massive than our sun, G-type stars (yellow dwarf) are consistent with our sun-a main-sequence G2V star. These targets will include 100 stars within 33 light-years of the solar system that fall into the F, G, and K types. The proposed CHES mission will operate at the sun-Earth L2 Lagrange point-where NASA's James Webb Space Telescope (JWST) currently resides-and observe target stars for five years. In this case, researchers from the Chinese Academy of Sciences (CAS) and multiple Chinese observatories and Universities propose a space telescope that could take high-precision astrometry measurements of sun-like stars to detect exoplanets orbiting them.
This data will be used to create the most precise three-dimensional map of our galaxy ever made. Examples of this method include the ESA's Gaia Observatory, which has been measuring the motion of 1 billion stars in the Milky Way (as well as 500,000 distant quasars) since 2013. The branch of astronomy known as astrometry consists of taking precise measurements of the positions and proper motions of celestial bodies by comparing them to background reference stars. This proposed observatory will search for Earth-like planets in the habitable zones (HZs) of sun-like stars within approximately 33 light-years (10 parsecs) using a method known as micro-arcsecond relative astrometry. In a recent study, a team led by the Chinese Academy of Sciences (CAS) described a new space-telescope concept known as the Closeby Habitable Exoplanet Survey (CHES).
In the coming years, the opportunities for exoplanet studies will increase considerably as thousands more are discovered.
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