I doubt that "magic" is derived from "magi". I checked the etymology section for "magic" at Wiktionary, and it doesn't mention anything about being derived from "magi". You may want to check additional sources to be sure. The two may be related to one another, but it doesn't seem that the word "magic" is directly derived from "magi". Even if it were, that really doesn't prove anything about the nature of magic - it would only show the opinion of the people who started to use it this way.
No. The stars are not a source of magic.
Since magic only exists in fiction, how magic works and where it comes from is entirely up to the person writing a particular work of fiction.
You can only get magic mushrooms from unicorns. Unfortunately, that means a trip all the way to Africa, since that's the only place to find unicorns.
Yes, since miracles are magic
It was derived to mathematicians of the time and ever since.
Since magic is fictional, its source can be whatever the author writing about it wants it to be.
Typically, Zeus was considered the chief of the Greek pantheon. His name even points to this, since it is derived from the same ancient root word as the Latin deus, which means "god" and dies which means "day". The origin root means "to shine brightly".Incidentally, the Roman counterpart, Jupiter also derived from this same source.
Well, since "Sabrina" isn't derived from a slavic word or name, but it comes from the latinized form of Severn, which is a Welsh river, in Bulgarian, "Sabrina" is again "Sabrina".
Typically, Zeus was considered the chief of the Greek pantheon. His name even points to this, since it is derived from the same ancient root word as the Latin deus, which means "god" and dies which means "day". The origin root means "to shine brightly".Incidentally, the Roman counterpart, Jupiter also derived from this same source.
As of 2011, about 42 percent of electricity in the US was derived from coal. There is a push in the 21st century to use other methods of electricity since coal is harmful to the environment.
Since 2007
There is lots of mentions of magic in the Bible, for example, except it usually isn't called by that name. For example, Jesus converting water into wine. I have no way to ask God (and get a reliable answer), but I would say, IF magic exists, it wouldn't be inherently good or bad; rather, it could be used for good or bad purposes, depending on who uses it, and how. As an example, take the Harry Potter books. They don't really PROVE anything (they are fictional stories), but they illustrate how magic might be used for good, as well as for evil.