Re: Why aliens?
Umm... it's not every 70 years, they've been doing it over the last 70 years(they've only been observed for the last 70 years). Your reading comprehension is pretty bad... maybe they're not stars, maybe they are something that aliens use for creating stuff. Some kind of method to convert something into massive amounts of energy. It probably isn't anything to do with aliens, but theres a small possibility.
Biting the hand that feeds IT
