Ultra Long-Duration Balloon (ULDB) Project
A project, managed by Goddard Space Flight Center, to fly balloons on missions
lasting up to 100 days at the edge of space. The pumpkin-shaped ULDB is
the largest single-cell, sealed balloon ever flown, with a fully-inflated
diameter of 58.5 m and a height of 35 m. It is designed to inflate gradually
as it approaches its cruising altitude of 35 km – above 99% of Earth's
atmosphere-and then circumnavigate the globe while taking measurements with
its scientific payload. NASA sees the ULDB as offering a cheap alternative
to certain kinds of low-Earth-orbiting satellite missions.
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