ETs March 18, 2019March 16, 2019 ~ susie 0 shares Share Tweet Pin An astronomer at Columbia Univ. has a new guess about how hypothetical alien civilizations might be invisibly navigating our galaxy. – @NBCNewsMACH https://t.co/1UdjZKmukX— NBC News (@NBCNews) March 16, 2019 Share this:FacebookXLike this:Like Loading... Published by susie View all posts by susie