I came across this article about Tabby's star. There have been articles written about it in the past regarding it's strange behavior (and the possibility aliens could be responsible). Apparently it's behavior is stranger than first thought; it has dimmed significantly since observations first began. http://www.sciencealert.com/we-just-got-even-weirder-results-about-the-alien-megastructure-star?0_052871585823595524=