Since it explored Pluto in 2015, the New Horizons spacecraft has been zooming toward NASA's most distant target yet. Join the mission team as the probe attempts to fly by Ultima Thule, an object 4 billion miles from Earth.
Craig Sechler
Joel Parker
Marc Buie
Michael E. Brown
David Jewitt
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Score: 6.8
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Score: 6.0
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Score: 5.8
