Knowing the exact number of stars around which planets orbit is practically impossible. However, there are several search programs for stars and exoplanets that allow their discovery and further study.
The most recent studies, such as the Institute of Astrophysics in Paris, have confirmed that there are numerous stars with orbiting planets in the Milky Way. The study concludes that one in six stars has at least one planet with a mass similar to that of Jupiter, half have planets of mass similar to Neptune and two thirds house super-lands. The latter have between one and ten times the mass of the Earth.
This study concludes that stars with orbiting planets are very common in the galaxy. In January 2013, astronomers at the Harvard-Smithsonian Center for Astrophysics estimated that the Milky Way is home to at least 17 billion Earth-sized exoplanets. These estimates were made possible by the data provided by the Kepler probe.
Logically, in the not too distant future, the numbers of new exoplanets may be considerably increased. This will be possible thanks to the improvement of the observation instruments, the increase in study time and the increase in the total controlled area of the galaxy.
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