- 
  
  The date at which it launched.
- 
  
  When the second one launched.
- 
  
  This mission started on this date.
- 
  
  This was during May of 1961
- 
  
  this was the first time it launched.
- 
  
  the Marnier 5 was launched on this date.
- 
  
  The first probe number 7 to launch to Venus.
- 
  
  This is when it landed on Venus
- 
  
  This is when this station launched.
- 
  
  This station launched on this date.
- 
  
  This date is when the Viking Probe #1 was launched.
- 
  
  This is when #1 reached Mars orbit.
- 
  
  This is when it landed on Mars.
- 
  
  this when the second voyager was launched.
- 
  
  This is when Voyager 1 is launched.
- 
  
  This mission ended on this date.
- 
  
  This was the first shuttle took off.
- 
  
  On this date the Genesis Mission was launched.
- 
  
  The Megalon was launched on this date
- 
  
  The Gallileio Mission was launched on this date.
- 
  
  The Hubble Space Telescope was launched on this date but then broke when it was in space. Took 3 years to repair then launched again.
- 
  
  The first NEAR was launched on this date.
- 
  
  The Sojouner launched on this date.
- 
  
  On this date the Cassini was launched to visit Saturn.