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    $\begingroup$ Please read astronomy.stackexchange.com/help/how-to-ask on how to ask good questions. It includes presenting your own research / search results and explaining why or how the results you get are insufficient. It's often a good idea to put as much work into a question as you expect another person to put into an answer. (We can help you with your homework, but we are not your homework ghost writers) $\endgroup$ Commented Jan 12 at 9:36