More like Impulse Shock

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Known SpaceUniverse
universe142 books1964
About aliens, set in other star systems.
“Give a clever species a few centuries and a working fusion drive, and it will fill the sky with problems.”
from the catalogue
Start with Ringworld →
includes Man-Kzin Wars, Ringworld, Fleet of Worlds
Old Man's WarSeries
series16 books2005
Set in other star systems.
“Sign a document at 65, saying you intend to join up 10 years later.”
from the catalogue
Start with Old Man's War →
HonorverseUniverse
universe83 books1993
Set in other star systems.
“At the center stands one officer, Honor Harrington — captain, then something far larger — and the six-limbed empathic treecat who rides her shoulder.”
from the catalogue
Start with On Basilisk Station →
includes Honor Harrington, Saganami Island, Worlds of Honor anthologies, Wages of Sin, Expanded Honorverse, Manticore Ascendant, Honor Harrington Universe short fiction, Star Kingdom (Honor Harrington)
VattaUniverse
universe10 books2003
Set in other star systems.
“Get kicked out of the Academy and the family still hands you a ship.”
from the catalogue
Start with Trading in Danger →
includes Vatta's War, Vatta's Peace
The Lost FleetUniverse
universe27 books2006
Science fiction and space opera, set in far future and space.
“A war a hundred years old has forgotten how to fight it.”
from the catalogue
Start with Dauntless →
includes The Genesis Fleet, Beyond the Frontier, Outlands (The Lost Fleet), The Lost Stars
Ender's GameUniverse
universe39 books1977
Science fiction, set in far future.
“To beat your enemy you must first understand him so completely that you love him — and in the instant you love him, you destroy him.”
from the catalogue
Start with Ender's Game →
includes First Formic War, Ender's Shadow, Second Formic War, Ender Wiggin, Fleet School