The sun is one of over 100 billion stars in the Milky Way Galaxy. The sun is made up of entirely gas. The sun is the nearest star to Earth. Nine planets revolve around the sun in paths called orbits. 1.3 million Earths can fit inside the sun. Earth travels around the sun at an approximate distance of 92,960,000 miles from it. Hydrogen is the sun's fuel. It uses about 4 million tons of hydrogen every minute. The part of the sun we see has an average temperature of about 5800 K. Scientists measure star temperatures in Kelvin. One degrees Fahrenheit or 15 million K.
Nobody can go to the Sun because it's too hot for visitors! Asteroids(minor planets), comets, planets, meteroids and dwarf planets orbit the Sun, one of the planets orbiting it is Earth!
The Earth's approximate distance from the Sun is 1 Astronomical Unit (AU) or (149.9 million km) that is why life and water exist on the planet. Over billions of years ago, the Earth was much closer to the Sun than now so no life survived there, then the Sun got bigger (see: solar life cycle) and the planets moved out and created their own orbital paths around it. The atmosphere and surface of our planet cooled and condensed to form the crust and rivers and oceans started appearing, and then life formed!
The sun formed about 4.6 billion years ago, and has enough hydrogen to last for another 5-6 billion years. When the hydrogen in our Sun is burned up, the temperatures lowen and the star will expand into a size about 30-80x bigger than its normal. Our nearest star, will enter its red giant phase and destroy the Earth! But not to worry, because this will happen in billions of years!