The Sun is the star at the center of the Solar System. It is a massive hot ball of plasma, inflated and heated by nuclear fusion reactions at its core. Part of this internal energy is emited from the Sun's surface as light, ultraviolet, and infrared radiation, providing most of the energy for life on Earth.
If Sun is replaced by another star in our existing solar system then planets may not continue orbiting that star. It all depends on the mass of that star. If it is heavier than sun then planets may ultimately collapse into it or may take different orbits.
Arcturus is the brightest star in the northern constellation of Boötes. With an apparent visual magnitude of −0.05, it is the fourth-brightest star in the night sky, and the brightest in the northern celestial hemisphere.
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