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StackExchange launched in September 2009.

When did Physics StackExchange launch in history?

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    $\begingroup$ Note that the September 2009 launch date for SE is a bit hazy. Stack Overflow launched on September 2008, with Server Fault and Super User coming after, and then a branching out into other areas. The 'launch date' of SE depends a fair bit on what you mean by that. $\endgroup$ – Emilio Pisanty Nov 15 '16 at 21:03
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One handy place for this information is the user page of the Community ♦ user, which gives the bot's inception date as 1 November 2010.

For more information, you can go to the original Area 51 proposal, which gives a detailed breakdown of the milestones:

  • The original proposal was posted on 2 June 2010
  • Private beta started on 2 November 2010
  • Public beta started on 9 November 2010
  • The site graduated from beta status on 24 February 2011 (source)
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The list of Stack Exchange site shows some statistics about each site, including its age. Physics launched six years ago, apparently in November of 2010.

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