There's some good SF written by people who know science.
Travis Taylor is a scientist and engineer who writes some good stuff, especially when partnered with John Ringo.
Baen Books has some great authors, and for most of the books you can read the first few chapters online to see if you like it, then either order the physical book, or download an ebook to Kindle. Baen also has a library of free eBooks by selected authors.
Some of my current favorite authors are John Ringo, Travis Taylor, Tom Kratman, Larry Correia, Orson Scott Card, and David Drake.
Travis Taylor.....”Safety Third”