NASA is considering issuing a challenge for developing stratospheric airships that can break records for duration of flight at high altitudes.
from News and Features - NASA's Jet Propulsion Laboratory http://ift.tt/1uCrIhK
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NASA is considering issuing a challenge for developing stratospheric airships that can break records for duration of flight at high altitudes.
This artist’s concept depicts a smaller white dwarf star pulling material from a larger star, right, into an accretion disk. Earlier th...
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