Great and comprehensive post on this topic! Just to add some grains of salt: Variable stars are for instance used in searches for dark matter (actually, galaxies made mostly of dark matter) as standard candles (in particular the Cepheids you mentioned).
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Thanks @lemouth. I am really happy when i get such a wonderful comment specially when it comes from you. I didnt have any idea about this what you added about the search for dark matter. Thanks for mentioning this :) There is always something new to learn :)
This is just so true for everyone! ^^