The most recent issue of Free Astronomy Magazine (November-December 2019) is available for your reading and downloading pleasure at www.astropublishing.com (click the link to go directly to the issue).
As editor-in-chief Michele Ferrara alludes to early in his “flexible concept” article on page 38, there’s been quite the transition into the study of exoplanets and the potentials for habitability as a way to more credibly have the discussion about alien life.
His article on page 22 is worth the read for those who think it’s not a question of “if” but of “how often?”
For those wanting a quick look at what the issue has to offer, the Table of Contents is reproduced below.
The web browser-readable version: www.astropublishing.com/6FAM2019/
Jump right to the PDF download (14 MB): November-December 2019