In 1543, Copernicus published a book about a new idea he had. Most pople in his day thought that the Earth was the centre of the Universe. But, Copernicus disagreed. according to him, the Universe is not centred around the Earth, but the Earthis actually a planet circling the Sun.
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No. There is one star in our solar system, and no other solar systems within it.
There are no exoplanets in our solar system. By definition, an exoplanet is a planet that is not in our solar system.
Our Solar System
Its a planet, NOT a solar system.
No, Sirius is not part of our solar system. The only star in our solar system is the sun.