To the Moon! (use the model)  As the Apollo missions left the Earth's orbit and headed to the Moon, their speed was about 24,000 miles per hour. The.

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Presentation transcript:

To the Moon! (use the model)  As the Apollo missions left the Earth's orbit and headed to the Moon, their speed was about 24,000 miles per hour. The engines were off.  By the time they reached a point 30,000 miles from the Moon (37 cm from the model Moon), they had slowed to 2,000 miles per hour.  From that point on, they began to speed up once again. WHY? Hint: the relationship of two objects masses and distance apart.

To the Moon!  The reason: at first, the Apollos were slowed by the pull of Earth's gravity. That point (30,000 miles from the Moon) is where the pull of the Earth and the Moon are equal.  Once past that point, the crafts began to speed up once again because of the net force caused by Moon's gravity.

The Moon and its phases  The moon (p. 603)  Earth’s one natural satellite  Moon’s length of orbit  Shape of orbit  2 astronomical phenomena associated with Earth-Moon system  How much of the moon is illuminated at all times?  Why do we see only a percentage?  Why do we sometimes see the moon during the day?

The Moon and its phases  The moon  Earth’s one natural satellite  Moon’s length of orbit  Shape of orbit  2 astronomical phenomena associated with Earth-Moon system  How much of the moon is illuminated at all times?  Why do we see only a percentage?  Why do we sometimes see the moon during the day? Moon One month Elliptical Moon phases and solar and lunar eclipses --Half --What is seen is dependent on the position of Earth and Sun relative to the moon --Only during full/new moon phase are they in a line; other times moon is not blocked

The Moon and its phases  The phases of the moon (p. 603)  Describe each: (how it appears)  New Moon (2 days after)  Crescent moon (following week)  Half Circle (another week)  Gibbous  Full (next 2 weeks) Summary : Phases are the result of what 2 factors in the Earth Moon System?

The Moon and its phases  The phases of the moon (p. 603)  Describe each: (how it appears)  New Moon (2 days after) starting point; not visible  Crescent moon (following week) thin sliver; low in Western sky after sunset (Waxing)  Half Circle (another week) Illuminated side visible; noon to midnight  Gibbous ¾ illumination;  Full complete disk visible (begin waning) Summary : Phases are the result of what 2 factors in the Earth Moon System? Moon motions; and reflection of sunlight from surface

Cookie moon phases: Answers to discussion ?s  1. position 1-4 is waxing (increasing the surface seen); 5-8 waning, decreasing until not visible (new moon)  2. Due to revolution of moon around Earth, causing different portions being lit by the sun    5. rises in east and sets in west  6. one cycle is completed in 28.5 days  7. approx. 14 days to go from full to new moon phase  8. length of month is from phases  9. the crater always faces Earth, caused by the period of moon’s rotation and revolution  max in a year; if second in a month== blue moon  11. solar eclipse = position 8; lunar = position 4.

Discussion questions:  1. How long does it take now to travel to the moon? What if we could travel at the speed of light, how long then?  2. If the moon’s revolution speed was half as fast as it is now, how long would it be between full moons.  Choose only 1: 3 or 4  3. What would the effects be if we had no moon  4. It is the year 3000 and humans are interested in starting a colony on the moon. The moon has no atmosphere. Plants require oxygen and carbon dioxide to grow. What could be done to allow for the plants to grow? There are also period where there would be no sunlight, how long would these periods be?