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

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

4. Eclipses
Lunar
Solar

5. 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.

7. 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.

8. 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

9. Answer Questions #1-15 Review Book p. 276

10. 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

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

12. 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 rest)

14. The Solar System

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

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

19. 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

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