Ultima Thule, at 4 billion miles (about 6.4 billion km) from the Sun and 1 billion miles (about 1.6 billion km) from Pluto, will be the most distant object ever directly explored, according to NASA.
The farthest spacecraft from Earth are shutting off instruments in interstellar space, but their mission in interstellar space isn’t over yet ...
The motor was tested to 500,000 steps on Earth, which guaranteed it would operate through Voyager 2’s flyby of Saturn in ... well beyond the orbit of Pluto. Instruments necessary for collecting ...
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