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" ... But researchers are pessimistic. Nosanov, the NASA fellow, says a sailship mission to the heliopause would cost between $1.7 billion and $3.4 billion or between one and two times the size of NASA's $1.5 billion-a-year planetary science program. For now, at least, exploring the heliopause is out of reach from a financial standpoint. Schwartz's scenarios may be possible according to physics, and even according to engineering, Nosanov said, but not according to economics as we know it. ... "