how long do you think it will be before we begin to use antimatter to power spacecraft

Question: how long do you think it will be before we begin to use antimatter to power spacecraft
- Keywords:
  antimatter,
  spacecraft
Asked by mboromax to Col Op, Elie, Floris, Jenn, RocketRich on 15 Mar 2016.
- Jenn Wadsworth answered on 15 Mar 2016:
  
  Creating and containing anti matter is pretty difficult, I think the next big energy breakthrough will be in nuclear fission! That would generate a heck of a lot of clean energy, using the same mechanisms our sun does to emit energy! 😀

Question: how long do you think it will be before we begin to use antimatter to power spacecraft