At the 2012 Astrobiology Science Conference, a panel of exoplanet scientists gathered together to hold a lively discussion about some of the most important issues facing the search for and understanding of planets orbiting far-distant stars. In part four of this series, the panelists take a moment to answer questions from the audience.

The transcript of the plenary session is now available at: http://www.astrobio.net/debate/5425/the-great-exoplanet-debate-part-4-questioning-habitability . A video of the plenary session is also available at: https://connect.arc.nasa.gov/p68qflmgnhk/?launcher=false&fcsContent=true&pbMode=normal