article_snippet: Dr Sarah Ballard of the University of Washington in Seattle said exomoons could be the 'predominant sites of life in the universe'.
article_snippet: Too close to a star and an exomoon may have an average temperature above the boiling point of water, making it highly unsuitable for any form of life.
article_snippet: So far, no exomoons have been discovered, but given that six of the eight planets in our solar system have moons, most astronomers regard no exomoons as an inevitability rather than a possibility that one will be found.
article_snippet: Finding exomoons is a bit of a problem though, as their mass and size is so much less than their host planet.
article_snippet: So far, no exomoon has been discovered, but given that six of the eight planets in our solar system have moons, most astronomers regard no exomoon as an inevitability rather than a possibility that one will be found.
highlights_snippet: Dr Sarah Ballard of the University of Washington said exomoons could be the 'predominant sites of life in the universe'
  Many planets discovered outside the solar system are Jupiter-sized worlds .
  