Sun and our solar system

why do planets revolve around the sun in an elliptical orbit 1 why are planetary orbits circular 2 are planet orbits circular or elliptical 3 do all planets have elliptical orbits 4 The Sun is the only star in our solar system. It is the center of our solar system, and its gravity holds the solar system together. Everything in our solar system revolves around it – the planets, asteroids, comets, and tiny bits of space debris. 5 Science Reference The sun, explained Learn more about the life-giving star at the center of our solar system. By Michael Greshko and National Geographic Staff Published Septem. 6 Our solar system consists of our star, the Sun, and everything bound to it by gravity – the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune; dwarf planets such as Pluto; dozens of moons; and millions of asteroids, comets, and meteoroids. Beyond our own solar system, there are more planets than stars in the night sky. 7 The Sun contains almost ALL of the material in our solar system. 99% of it. All the planets, asteroids and comets add up to less than 1% of the total. The Sun is so far away that it takes light about 8 minutes and 20 seconds for it to get to us – and light is the fastest thing in the universe. 8 A breakthrough electronic book about our Solar System, offering hours of interactive exploration and presenting a treasure trove of visual information. 9 We all know that the Earth, the other planets and their moons all revolve around the Sun in elliptical orbits. 10