If you are the one who is interested in reading about stars and galaxies and other celestial bodies, then you must be aware of the term solar system. It is given the name of solar system because all the planets, including dwarf planets, moons, and various other celestial bodies revolves around the sun in their respective orbit. The major planets in our solar system include Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. There are some dwarf planets as well which are once considered as a planet, these include Pluto, Ceres, Makemake, Haumea and Eris.
Order of Planet based on Distance from the Sun
Following is given the order of planet in terms of their distance from the Sun:
Mercury – 57,910,000 km (0.38 astronomical unit, or AU) from the Sun
Venus – 108,200,000 km (0.72 AU) from the Sun
Earth is 149,600,000 km (1.00 AU) from the Sun
Mars is 227,940,000 km (1.52 AU) from the Sun
Jupiter is 778,330,000 km (5.20 AU) from the Sun
Saturn is 1,429,400,000 km (9.54 AU) from the Sun
Uranus is 2,870,990,000 km (19.218 AU) from the Sun
Neptune is 4,504,000 000 km (30.06 AU) from the Sun
Over the ages, there has been much enthusiasm regarding the origin of solar system. No certain conclusion has been produced but for guesswork.
Theory has it that the solar system formed in a cloud of interstellar gas or dust which collapsed under its own gravity due to some disturbance maybe by a supernova taking place nearby. The nebula collapsed in the center and heated up so much that the dust vaporized and all this in less than 100,000 years.
The compressed center became so dense that it formed a ‘proto star’ around which the rest of the gas flowed forming an amassment disk around the star before eventually cooling down
With the condensation of metal, rock and ice, the solar system continued originating. The metal and the accretion disk formed simultaneously while it took longer for the rocks. Meteorite isotope measurements estimated this to have taken place 4.55-4.56 billion years ago. Boulders and small asteroids formed through the collision of dust particles with each other.
A large particle capable of drawing in smaller particles into its orbit formed and its size depended on its distance from the star, the composition and density of its own nebula. Planet formation depended upon its distance from the sun and the furthest planets took longer to form.
The cooling nebula, sweeping away the gas surrounding it, would have generated a powerful solar wind. A large enough proto-planet would have pulled the nebular gas forming a gas giant otherwise it would remain an icy or rocky body and these proto-planets and gas giants would have collided with each another to form large ethereal bodies having stable orbits and the solar system that we study today. Still the question of as ‘how quickly did these proto-planets form and how large were they?’ remains unanswered.