Prime Timeline
   | Year | 
   Event | 
   | 1957 | 
   
      
       
         ● [1]
         Sputnik 1 is launched, Earth's first artificial satellite. The launch is observed by a Vulcan vessel which subsequently crashes on the planet, stranding the crew there for some months. [2]
      
 
       | 
   
Colour key
● - Shows the canon status and reference of the year for this event
References
| # | 
Series | 
Season | 
Source | 
Comment | 
| 1 | 
 | 
 | 
Speculative | 
Date is assumed to be the same as in the real world timeline | 
| 2 | 
ENT | 
2 | 
Carbon Creek | 
It appears from the episode that this was indeed a real event and not just a story |