what possibilities of other paralell worlds are there such as ones with liquid methane seas and sulfuric acid instead

Question: what possibilities of other paralell worlds are there such as ones with liquid methane seas and sulfuric acid instead of air ?
- Keywords:
  life,
  philosophy,
  universe
Asked by rolina23 to Ed, Hayley, Jason, Nathan, Sophie on 18 Mar 2013.
- Hayley Evers-King answered on 18 Mar 2013:
  
  We’ve yet to discover any parallel universes or worlds. However there are lots of planets out there that are very different to our own – made entirely of gas or with methane seas like you mention! So there could be lots of possibilities!

Question: what possibilities of other paralell worlds are there such as ones with liquid methane seas and sulfuric acid instead of air ?