How long do you think it will be be before we start colonising other planets?

Question: How long do you think it will be be before we start colonising other planets?
- Keywords:
  colonise,
  life,
  planet
Asked by The Bear to Alex, Julia, Simon on 18 Dec 2015.
- Julia Attias answered on 18 Dec 2015:
  
  @the bear,
  
  Good question. I am not sure if we know the answer to the “colonisation of another planet” just yet, but I think we are fairly confident that humans will visit Mars at least within our lifetime.

Question: How long do you think it will be be before we start colonising other planets?