23.4 Minor Members of the Solar System

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Presentation transcript:

23.4 Minor Members of the Solar System Comets 23.4 Minor Members of the Solar System  Coma • A coma is the fuzzy, gaseous component of a comet’s head. • A small glowing nucleus with a diameter of only a few kilometers can sometimes be detected within a coma. As comets approach the sun, some, but not all, develop a tail that extends for millions of kilometers.

23.4 Minor Members of the Solar System Comets 23.4 Minor Members of the Solar System  Kuiper Belt • Like the asteroids in the inner solar system, most Kuiper belt comets move in nearly circular orbits that lie roughly in the same plane as the planets.  Oort Cloud • Comets with long orbital periods appear to be distributed in all directions from the sun, forming a spherical shell around the solar system called the Oort cloud.

23.4 Minor Members of the Solar System Comets 23.4 Minor Members of the Solar System  Halley’s Comet • The most famous short-period comet is Halley’s comet. Its orbital period is 76 years.

23.4 Minor Members of the Solar System Meteoroids 23.4 Minor Members of the Solar System  A meteoroid is a small, solid particle that travels through space.  A meteor is the luminous phenomenon observed when a meteoroid enters Earth’s atmosphere and burns up, popularly called a shooting star.  A meteorite is any portion of a meteoroid that reaches Earth’s surface.

23.4 Minor Members of the Solar System Meteoroids 23.4 Minor Members of the Solar System  Most meteoroids originate from any one of the following three sources: (1) interplanetary debris that was not gravitationally swept up by the planets during the formation of the solar system, (2) material from the asteroid belt, or (3) the solid remains of comets that once traveled near Earth’s orbit.