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4. What the sun?
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Answer:The Sun is the star at the center of the Solar System. It is a nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy mainly as light and infrared radiation. It is by far the most important source of energy for life on Earth.
Names: Sun, Sol /ˈsɒl/, Helios /ˈhiːliəs/
Mean radiance (Isol): 2.009×107 W·m−2·sr−1
Escape velocity (from the surface): 617.7 km/s; 55 × Earth
Equatorial surface gravity: 274 m/s2; 28 × Earth
Center density (modeled): 162.2 g/cm3; 12.4 × Earth
Luminosity (Lsol): 3.828×1026 W; ≈ 3.75×1028 lm; ≈ 98 lm/W
Step-by-step explanation:God blessed you all
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