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At The Edge Of Our Solar System, NASA's Voyager 1 Found A 'Wall Of Fire' - Jalopnik
(www.jalopnik.com)
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rule #1: be kind
Technically even the Voyager probes are orbiting something. It isn't a planet, and not even the sun anymore. It is orbiting Sagittarius A*, the black hole at the center of the Milky Way.
But yeah, probe is the more accurate term.
I had a feeling somebody was going to point that out…