A couple of questions.

Greetings...

I have a question or two...

First: Why is it that we only see one side of the moon? That would
mean that it's rotational orbit around itself...is the same length of
time that it takes to orbit around the earth. Which is what? 28.1 days
or something like that? -- Is this why people think that the moon was
once a part of the earth? Are there anymore natural satellites (moons)
around other planets that have the same feature? -- Is there a site
with charts of these orbital information?

Also, is there a list of the number of stars that we can see in the
night's sky, charted by light polution? How many can we see in the
night's sky with the naked eye?

.

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