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Week 8.5 9th grade science Must Do Make a list of all of the characteristics of the solar system you can think of. Think about… Planets & moons Temperature Motion and direction How it is layed out Astroids and comets Objectives Summarize the major features that a theory of solar system origins has to explain. The Formation of the Solar System There are nine outstanding properties of our solar system that any formation theory must be able to explain. In your table groups, see how many you can come up with. Each planet is relatively isolated in space. Planets are independent bodies that are not bunched together. In rough terms, each planet tends to be twice as far from the sun as its inward neighbor. The orbits of the planets are very nearly circular With the exception of Mercury and Pluto each planetary orbit closely describes a perfect circle. The orbits of the planets all lie in nearly the same plane. Within a few degrees. With the exception of Mercury and Pluto The direction in which the planets orbit the Sun is the same as the direction in which the Sun rotates on its axis. Counterclockwise as viewed from above the north pole. Virtually all motion is on the same plane as the earths equator and in the same direction as the Sun’s rotation. The direction in which most planets rotate is roughly the same as the direction the Sun rotates …except Venus, Uranus, and Pluto Most moons revolve about their planets in the same direction the planets rotate. Our planetary system is highly differentiated Inner planets are characterized by high densities and moderate atmospheres, slow rotation rates, and few or no moons. The jovian planets are further from the sun have low densities, thick atmospheres, rapid rotation rates, and many moons. Asteroids are very old and exhibit a range of properties differing from our planets and moons Share similar orbital properties as the planets. Made of primitive unevolved material, meteorites that strike Earth are the oldest rocks known. Comets are primitive icy fragments that do not orbit in the elliptical plane and are far from the Sun