i dont get this at all

Science
Tutor: None Selected Time limit: 1 Day

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

Charon is the largest moon while Pluto is small and is furthest from the sun, therefore, they would eclipse one another like on daily basis.

I will explain further in the dialogue box

May 27th, 2015

Charon and Pluto revolve about each other every 6.387 days. The two objects are both gravitationally locked to the other, so each keeps the same face towards the other, that is why Pluto moon stays at the same place in the Pluto's sky. This is a case of mutual tidal locking, compared to for instance Earth and the Moon

May 27th, 2015

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May 27th, 2015
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May 27th, 2015
Dec 6th, 2016
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