If you are looking for information about the Traveller Universe...

There are several:

Traveller's Guide to the Universe - from The Traveller Book (Classic Traveller), an intro to Traveller. Maybe you can find this on PDF. Less than 10 pages.

Traveller Integrated Timeline - a great resource all about the history of the Traveller Universe by an Absent Friend, Don McKinney. Search for the PDF. But it's 133 pages.

A CHRONOLOGY OF THE IMPERIUM - 2 pages in the MegaTraveller Imperial Encyclopedia.

Plus, you can keep track of your own findings and creations.

• Secrets and Hidden Gems of your Game or Campaign
• Natural Wonders of Charted Space - any that you find along the way
• In Your Traveller Universe (IYTU) - changes you made to the official rules or setting.
• NPC Roster - don't throw them away. You can reuse them with minor changes to stats and new clothes. Plus, you can have recurring characters that way. This definitely includes Patrons.
• Ship Encounter Roster - if they talk to someone on a ship on orbit around Ruie, they might run into them again somewhere else in the Regina subsector. Especially Merchants on a Trade Run, or Naval Vessels on Patrol.
• Music and Entertainment of Charted Space