How come the universe is made from matter and not antimatter?

Question: How come the universe is made from matter and not antimatter?
- Keywords:
  antimatter,
  matter,
  space,
  universe
Asked by Jasmine Y to Anna, Hayley, Iain, Rebecca on 17 Jun 2015.
- Iain Bethune answered on 17 Jun 2015:
  
  No-one has a convincing theory why this happened. It’s an open question in cosmology and particle physics. Maybe one day you could help figure out the answer!

Question: How come the universe is made from matter and not antimatter?