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Memory Alpha is a collaborative project to create the most definitive, accurate, and accessible encyclopedia and reference for everything related to ''Star Trek''. The English language version was started in 2003 as an independent wiki and now consists of more than 50,000 articles and 50,000 images.

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Memory Alpha is a collaborative project to create the most definitive, accurate, and accessible encyclopedia and reference for everything related to Star Trek. The English-language Memory Alpha started in November 2003, and currently consists of 53,522 articles. If this is your first visit, please read an introduction to Memory Alpha.


Warning: Memory Alpha contains spoilers!
Star Trek: Strange New Worlds
Star Trek: Prodigy
Star Trek: Picard
Star Trek: Discovery
Upcoming productions: Star Trek: Lower DecksStar Trek XIV
Where to watch: Paramount+ (US) • CTV Sci-Fi Channel/Z/CraveTV (Canada) • Amazon Prime/Netflix/Pluto TV (elsewhere worldwide)

Interactive timeline

With the Star Trek franchise growing faster than ever, this interactive video timeline will serve as a springboard for fans, young and old, to experience how Star Trek history fits together. Styled to mimic the LCARS interface, a simple click through the timeline will introduce you to each era with a video overview. Here you will discover key plot points of each of the series and movies set during that time. You also have the option to dive deeper in each subject by bringing up articles directly from within the video. Click below to discover more information about Memory Alpha in a unique way!

A Memory Alpha - Fandom collaboration, this interactive timeline aims to guide you through all the various ships and captains along with where they fall in Trek history.
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Latest news

7 May 2022
Actor Kenneth Welsh, who played Senna Tal in the Star Trek: Discovery third season episodes "People of Earth" and "Forget Me Not" has passed away on 5 May 2022 at the age of 80. [1]
6 May 2022
Actor Michael G. Hagerty, who appeared in two episodes of Star Trek: The Next Generation has passed away on 29 April 2022 at the age of 67. [2]
4 May 2022
Actor David Birney, who played Senator Letant in the Star Trek: Deep Space Nine sixth season episode "Tears of the Prophets" has passed away on 29 April 2022 at the age of 83. [3]
Upcoming episodes/filmsUpcoming merchandiseToday in Trek history

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Featured article

Phase cannons1.jpg
Phase cannons being deployed
A phase cannon was a phase-modulated energy weapon, a type of particle weapon which served as a successor to plasma cannons and as a precursor to the phaser of the 23rd and 24th centuries. The prototypes of ship-mounted phase cannons were first introduced by Starfleet in the mid-22nd century, designed as the primary defense of NX-class starships. The first NX-class vessel to test and actively use phase cannons in battle was the NX-01 Enterprise.

Designed as a starship-based version of the hand-held phase-pistol, the phase cannon was rated for a maximum power output of five hundred gigajoules. The cannons were mounted on retractable turrets which extended from the ship's hull when deployed and rotated as they were being targeted. Like phase-pistols, they emitted a concentrated beam of energy that could be set at different yields. The phase cannon assembly was equipped with multiphasic emitters and had a maximum yield of eighty gigajoules. Aboard an NX-class vessel, the assembly was located on F Deck and could be accessed through a hatch near the torpedo room.

The cannons were first installed aboard Enterprise in 2151. They were generally more powerful than spatial torpedoes and were therefore more effective in a firefight. Although they were not always powerful enough to penetrate the defenses of enemy vessels, they proved to be an integral part of the ship's defenses throughout the early 2150s.

Picture of the Day

USS Enterprise-A in spacedock.jpg
"My friends, we have come home."
"My friends, we have come home."
(Star Trek IV: The Voyage Home)


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The Star Trek trademarks, logos, and related names are owned by CBS Studios Inc., and are used under "fair use" guidelines.
The user-created content of this site is released under the Creative Commons "Attribution-NonCommercial" license version 4.0. See Memory Alpha: Copyrights for more information.