Play Traveller 5E, the TTRPG descendant of the game that launched The Expanse...
to all those who say d20 can't do sci fi, it can do it well enough to get the Expanse from it.
The existence of the CotI boards are evidence that T20 attracted people to other versions of Traveller. It was a forum set up to promote discussion of T20 first, Traveller versions second, the setting third.
Go back to the early posts and you had people new to any kind of Traveller who had picked up T20, several of who are still playing Traveller to this day, usually using a different edition.
Question, which version of Traveller is Traveller?
Is it the original GDW game of '77, the revised version in '81 or the complete revision that was MegaTraveller in '87. Was TNE Travelkler with its different rules? Is T4 Traveller with its different rules, or T5?
Or is only Mongoose 2ed updated, revised updated now Traveller? With its advantage/disadvantage rule borrowed from 5E (how many of you ignore this rule I wonder?)
Is Traveller only a game set in the Third Imperium? If I have '77 rules on the table, use them to generate characters, but set a game in ancient Rome am I playing Traveller?
Traveller started life as a set of rules for you to make up your own setting, and it had the TL and equipment to set it in any historical era - perfect for running old school Dr. Who with its historical episodes, or Star Trek with a planet full of an ancient earth culture.
Life path mini game (many want a points based system, are they playing Traveller?), a PC level trading game, a ship construction system, a planet generation mini game, animal encounter charts based on ecology, equipment, combat
Is Traveller only Traveller if it has each of those? Is it only Traveller if it uses 2d6 (bye bye TNE, T4, T5).