Alderaan Endurance Datacron Location 
This Datacron unlocks the codex entry - Galactic History 44: The Jedi Nomi
This datacron holds unheard of power and knowledge collected by an ancient race. You access its power and discover writings which are clearly only one small piece of a massive galactic history:
Born Nomi Da-Boda, Nomi was the wife of the Jedi Knight Andur. She had no interest in developing her natural gifts in the Force, preferring to care for their daughter, Vima. But when they were ambushed by thugs and Andur was killed, Nomi saw his spirit urging her to pick up his lightsaber and defend their daughter. Reluctantly taking up the weapon, Nomi skillfully fought the thugs off and later left for the planet Ambria to train under Master Thon.
While on Ambria, Nomi discovered she had a talent for battle meditation--the Jedi gift of influencing and inspiring others through the Force--but never lost her trepidation at wielding a lightsaber. Nevertheless, Nomi's Masters foresaw that she would have an important role to play in the galaxy, which came to fruition with the rise of the Krath cult.
How To Retrieve This Datacron
IMPORTANT: In order to retrieve this Datacron you will need to buy the item, Red Detonite Actuator from Lain-Ricie who can be found in southern Juran Mountains. A screenshot is below of this NPC.
Coordinates: X 2722 , Y 242
This Datacron is located in southern Alderaan in King's Pass. As I mentioned before this paragraph you will need an item called a Red Detonite Actuator from Lain-Ricie who can be found in southern Juran Mountains. For an exact location of this NPC refer to (Screenshots 1 & 2). Once you have the Red Detonite Actuator travel far south in King's Pass until you come to a cave entrance (Screenshots 3 & 4). Be warned that this cave is filled with elites, it is going to be a challenge and maybe even impossible if you're not at least level 50.
Once you're in the cave go directly east until you come out to where I am on the map in (Screenshot 5). Here you will need to kill the two Killik mobs (or not...) and then arm the bomb via the Blast Pack on the rocks (Screenshot 6). Once you blast open the wall run through into the room and grab your reward!
A picture of the vendor that sells the Red Detonite Actuator that you need for this Datacron.
Location on the map of the vendor that sells the Red Detonite Actuator.
Location on the map of where you need to go in King's Pass to find this Datacron.
A picture of the cave entrance in King's Pass. (Location of this cave is in the picture above)
Where you will need to plant the charge inside the cave to reach the Endurance Datacron.
A picture of where the charge goes on the rock just to my left.
The Datacron on the otherside of the wall up close.
An exact location of this Datacron on the map.