The Sun:

The Sun is our star, situated at the center of the solarsystem at a distance of 150 million km from the earth. The sun is the brightest object in the sky. The sun accounts for about 99.8% of mass of the solarsystem. All other objects in the solarsystem revolve around the sun. Without sun, life will not have evolved on our planet. Energy from the Sun, in the form of sunlight and heat, supports almost all life on Earth via photosynthesis, and drives the Earth's climate and weather.

Our sun is at two-thirds distance from the center of the milkyway galaxy(on the disc of the milkyway galaxy).It takes the Solar System about 225-250 million years to complete one orbit of the galaxy (a galactic year), so it is thought to have completed 20-25 orbits during the lifetime of the Sun and 1/1250th of a revolution since the origin of humans. The orbital speed of the Solar System about the center of the Galaxy is approximately 220 km/s. At this speed, it takes around 1400 years for the Solar System to travel a distance of 1 light-year, or 8 days to travel 1 AU.

The Sun is about halfway through its main-sequence evolution, during which nuclear fusion reactions in its core fuse hydrogen into helium. Each second, more than 4 million tonnes of matter are converted into energy within the Sun's core, producing neutrinos and solar radiation; at this rate, the Sun will have so far converted around 100 Earth-masses of matter into energy. The Sun will spend a total of approximately 10 billion years as a main sequence star.

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