Fair warning, I only liked the first part of Seveneves; I thought the second part was stupid. You'll get a lot of recommendations for Liu Cixin's "Three Body Problem" which I personally hate (though the first part of the first book is very well written), but if you like all of Seveneves then it might suit you.
My personal favourites that might not already be on everyone else's lists:
Fiasco - Stanisław Lem
This is how you lose the time war - Amal El-Mohtar and Max Gladstone
Feersum Endjinn - Iain Banks
The Dark Side of the Sun - Terry Pratchett (yes, that one)
My personal favourites that might not already be on everyone else's lists:
Fiasco - Stanisław Lem
This is how you lose the time war - Amal El-Mohtar and Max Gladstone
Feersum Endjinn - Iain Banks
The Dark Side of the Sun - Terry Pratchett (yes, that one)
Blindsight - Peter Watts
Bloom - Wil McCarthy
Good luck!