Does the Earth revolve or rotate around the sun?

REVOLVESHow long does one revolution

take? ~ 1 yearDoes the moon revolve or rotate around the Earth?REVOLVE

SHow long does one revolution take? ~ 1

month

Approximately how much time passes between the phases of the moon?1 month ~ 30 daysThere are 8 phases of the moon30 divided by 8 ~ 3.8 days

How long does it take for the Earth to complete one rotation?

24 hours

Approximately how many hours pass from sunrise to sunset?

12 hours

We ONLY see one side of the moon!

True

False

WHY?

Which of the diagrams below illustrates a lunar eclipse? solar eclipse?

SOLAR

LUNAR

Which arrow is pointing to the penumbra? umbra?

http://www.teachertube.com/viewVideo.php?video_id=657&title=What_Causes_Seasons_on_Earth

What phase of the moon is shown here?

The phase of the moon depends on……

GIBBOUS

a.The amount of sunlit moon that faces the Earth.

b. The amount of moon’s surface lit by the sun.

If the sun were to just disappear someday, what would happen to the Earth?

What keeps the earth in orbit? GRAVIT

Y

What TWO factors affect the strength of a gravitational force?

MASS & DISTANCE

http://www.teachertube.com/viewVideo.php?video_id=539

1 2 3 4

1

2

3

Distance from Planet's Center

Forc

e of

Gav

ity o

n th

e R

ocke

t

(

Mill

ions

of n

ewto

ns)

Gravity and Distance

0

(Planet's radius =1)

Forc

e o

f G

ravit

y o

n t

he

Rock

et