Caleb scharf , an astrobiologist at columbia university who was not part of the research , said he was amazed .
凯勒沙佛，哥伦比亚大学的一位天体生物学家，没有参加这项研究，他说他对此感到惊奇。
Dr. morrison , the nasa scientist , has become the government 's de facto defender against the doomsday hypothesis , because of his role answering questions from the public on the ' ask an astrobiologist ' feature of the agency 's website .
In the next 15 to 25 years , there are likely to be two generations of space missions to analyze exoplanets in greater detail , said astrobiologist jean schneider at the paris observatory at meudon .
Dirk schulze-makuch , first author on the new paper and an astrobiologist at washington state university , said the team wanted to be as open-minded as possible .
