The asteroid belt initially contained more than enough matter to form 2—3 Earth-like planets, and, indeed, a large number of planetesimals formed there. As the material within the nebula condensed, the atoms within it began to collide with increasing frequency, converting their kinetic energy into heat.
The central purpose of scientific inquiry is to develop explanations of natural phenomena in a continuing and creative process SI 1. The first thing to notice is that the solar system is mostly empty space.
Jupiter thus would have consumed much of the material that would have created a bigger Mars. The bottom line is that many of the bodies are unique; the actual situation is too complicated for simple categorization.
Sizes The above composite shows the eight planets and Pluto with approximately correct relative sizes see another similar composite and a comparison of the terrestrial planets or Appendix 2 for more.
This cluster began to break apart between million and million years after formation. Jupiter, Saturn, Uranus and Neptune.
Traditionally, the solar system has been divided into planets the big bodies orbiting the Suntheir satellites a. The giant planets have diameters greater than km. This indicates that one or more supernovae occurred near the Sun while it was forming. The Sun remains a main-sequence star today.
Saturn, Jupiter, Mars, Sun, Venus, Mercury and Moon, based on the time for them to go "all the way round" the sphere of the "fixed" stars. A shock wave from a supernova may have triggered the formation of the Sun by creating relatively dense regions within the cloud, causing these regions to collapse.
However, this has been questioned during the last 20 years. These rocky bodies would become the terrestrial planets MercuryVenusEarthand Mars.
Then the model Earth would be about 1. A red-shift the Doppler effect in the light from very distant galaxies. Nice model and Grand tack hypothesis According to the nebular hypothesis, the outer two planets may be in the "wrong place". Models show that density and temperature variations in the disk governed this rate of migration,   but the net trend was for the inner planets to migrate inward as the disk dissipated, leaving the planets in their current orbits.
Assess correspondence between the predicted result contained in the hypothesis and actual result, and reach a conclusion as to whether the explanation on which the prediction was based is supported NY State Earth Science Reference Tables: In the pages that follow, I will use the conventional categorizations.
This caused Jupiter to move slightly inward. From that a minimum mass of the nebula i. The Nine Planets montage larger version of the above 36k jpg Another relative size comparison from LANL 93k gif Earth and small body comparison from Extrema 13k jpg Voyager 1 mosaic of the solar system from 4 billion miles out 36k jpg ; html caption Voyager 1 images of 6 planets from 4 billion miles out k jpg ; html Pale Blue Dotreflections on the above image by Carl Sagan.
Because the frost line accumulated large amounts of water via evaporation from infalling icy material, it created a region of lower pressure that increased the speed of orbiting dust particles and halted their motion toward the Sun. Mercury, Venus, Earth and Mars.The solar system consists of the Sun; the eight official planets, at least three "dwarf planets", more than satellites of the planets, a large number of small bodies (the comets and asteroids), and the interplanetary medium.
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Chapter 6 Our Solar System and Its Origin How was the Solar System Formed? A viable theory for the formation of the solar system must be based on physical principles (conservation of energy, momentum, the law of gravity, the law of motions, etc.).
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