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Impacts from Outer Space Lesson

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Our Solar System

Solar system includes

The Planets

A planet's orbit lies in an orbital plane, similar to a flat sheet of paper. The orbital planes of the planets are inclined. Planes of seven planets lie within 3 degrees of the Sun's equator, Mercury's is inclined 7 degrees, Pluto's is inclined 17 degrees

Two groups of planets occur in the solar system :