Overview
Traveller 2E is a sci-fi tabletop roleplaying game system, that was published in 2016 and updated in 2022, by Mongoose Publishing. It involves the characters adventuring through star systems, engaging in (space) exploration and engaging in battles both on ground and in space.
The system it directly evolved from is classic
Traveller (1977)
Description
The characers in Traveller can be humans, robots, aliens or of a genetically engineered species. Each character is distinguished by their occupation - whether they are a civilian, military, a noble, a young cadet or a veteran. Each type comes with their own strengths and weaknesses. To further expand on the sci-fi aspect of the game, some characters are prone to extra-sensory abilities, such as telekinesis, telepathy and others.
System Overview & Key Features
Lifepath Character Creation
When creating their character, players roll to determine their character's background, education, and career history. Characters will acquire skills, allies, enemies and physical injuries.
No Classes or Levels
Characters do not have traditional classes, and they do not gain experience points to level up. Progression is entirely material and narrative. Characters improve by acquiring better gear, installing cybernetics, buying larger starships, and finding lucrative trade routes.
The Trade and Commerce System
A massive part of the game involves interstellar economics. The rules provide deep, robust systems for buying speculative cargo on one planet and selling it at a profit on another. Players must factor in fuel costs, jump drive maintenance, and life support while managing their massive starship mortgage.
Lethal Combat
Gunfights are incredibly dangerous as the characters have very low health pools. These are directly tied to their physical attributes like Endurance, Dexterity, and Strength. A single shot from a laser rifle can instantly incapacitate or kill a character, making armor and cover absolute necessities.
Hex Crawling and Subsectors
The game provides incredible tools for the Game Master to procedurally generate entire sectors of space. Using a blank hex map and the core rulebook, you can roll up planetary environments, government types, law levels, and starport qualities to create a completely unique sandbox galaxy.
Additional links
mongoosepublishing.com 
https://mongoosepublishing.com - Official Mongoose Publishing website
travellermap.com https://travellermap.com - The Traveller Map (An interactive map of the official Third Imperium setting)