Hail Mary by Andy weir
(The guy who wrote the Martian, made into a film starring Matt damon)
Superb book really well written about end of the earth (unless) first contact with an alien species lots of science as it’s classified as a hard sci-fi novel.
I was making a mocha and a hot chocolate yesterday because we're supposed to make two at once... accidentally put the shots for the mocha in the hot chocolate and didn't realize it until it was too late