i dont know how to explain the difference

label Science
account_circle Unassigned
schedule 1 Day
account_balance_wallet $5

Pluto's moon Charon stays in the same place in Pluto's sky, but our moon moves across Earth's sky and is in a different place every day/night. What would reasonably explain this difference?

May 27th, 2015

If what you say is true, I'm not doubting you but I haven't looked it up, then it is due to tidal locking. Charon's gravity raises a tidal bulge on Pluto and vise versa. As each rotate the bulges have to move to stay aligned. The friction of in the curst resists the flexture and robs the bodies of their rotational motion until their rotations match their orbits. The Moon hasn't had time to tidally lock the much larger Earth yet. The Earth stays pretty much in the same place of the Moon's sky as the Moon is tidally lock with Earth...

and ....

The Moon moves around the Earth in an approximately circular orbit, going once around us in approximately 27.3 days, or one sidereal period of revolution. As it does this its position changes, relative to the stars. 
  Since there are 360 degrees in a circle, the Moon moves (on the average) 360 / 27.3 or 13.2 degrees per day relative to the stars, which is just over half a degree per hour, and approximately equal to its apparent size. This means that from night to night the Moon moves a little more than one hand-width to the East (the direction of its motion around the Earth) relative to the stars, and from hour to hour it moves about one diameter to the East, among the stars.

May 27th, 2015

Did you know? You can earn $20 for every friend you invite to Studypool!
Click here to
Refer a Friend
...
May 27th, 2015
...
May 27th, 2015
Sep 20th, 2017
check_circle
Mark as Final Answer
check_circle
Unmark as Final Answer
check_circle
Final Answer

Secure Information

Content will be erased after question is completed.

check_circle
Final Answer