Mr. Ahearn Earth Science 2010

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Presentation transcript:

Mr. Ahearn Earth Science 2010 Beyond Planet Earth Mr. Ahearn Earth Science 2010

Phases of the Moon Moon completes one revolution around Earth  one month. Lighted area appears to change shape (phases)

Eclipses Lunar Solar

Angular Diameter of Celestial Objects Angular diameter is the angle formed between the sides of an object and your eye Depends on objects size and distance away. (closer = larger, further = smaller) Celestial objects change in size in cyclic manner. Sun’s angular diameter is slightly bigger in winter than summer b/c it is closer.

Tides Twice daily rise and fall of oceans. Bay of Fundy (Canada) greatest difference in high and low tide (49 ft.) Caused by gravitational pull of moon and sun on ocean water. High tide  water attracted toward moon, and on opposite side where there is less force pulling water toward earth.

Tides Spring tide- highest high and lowest low tide (2x/month) during full and new moon. Neap tide- smallest difference in tides, 1st and last ¼ moons

Answer Questions #1-15 Review Book p. 276

Geometry of Orbits Planets that move around the sun have orbits that are slightly flattened circles called ellipses. (two foci along a major axis) Foci close  more circular. Foci near ends of circle  long and narrow ellipse

Calculate Eccentricity Eccentricity = distance between foci length of major axis ex.) distance b/w foci = 4cm major axis = 5cm What is the eccentricity?

The Force of Gravity Gravity is a fore of attractions b/w objects Depends on mass and distance Gravity holds planets and other objects in orbit. (satellite) Satellites move fastest when closest to sun & slowest when farthest Elliptical path depends on gravity and inertia (tendency to remain @ rest)

The Solar System

Big Bang Rapid expansion of concentrated matter that created the universe.

Earth is Unique Only planet with liquid water. Only planet w/ atmosphere w/ abundant free oxygen. ESRT p. 15

Asteroids, Meteors, and Comets Asteroids- rocky objects found mostly in the belt b/w Mars and Jupiter. Meteors- small solid particle from space caught by earth’s gravity, burn as enter earth’s atmosphere. Comets- Icy object that most likely originated in region beyond the planets

Answer Questions #16-33 Review book p. 283 Hale-Bopp

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