Strangest of All, A Free SF Anthology

Strangest of All is an anthology of science fiction stories with an astrobiological theme that was created for the European Astrobiology Institute's BEACON 2020 conference, which was cancelled because of the pandemic. However, the anthology is available for free download. 

It's mostly a reprint anthology with stories by Gregory Benford, Geoffrey Landis, and Peter Watts, among others. "The collected stories take readers on a journey to encounter life in the universe. The original nonfiction essays following each story consider our chances of finding life outside of the Earth, detecting it remotely, and learning its limits."

It's hard to go wrong here. It'd be worth getting just for the essays, much less the stories. I've read the Peter Watts story, "The Island", which is likely going to be the best in the book.