Space probe rocket boosters are leaving the solar system as well

I never considered this bit find it facsinating. We know about the Voyagers, etc but parts of their rockets are flying out into the darkness too.

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Every planetary probe was placed into its escape trajectory by a rocket booster. These boosters are themselves on nearly the same trajectory as the probes they launched. Because they cannot be actively guided, their trajectories are now different from the probes they launched (the probes were guided with small thrusters that allow course changes). However, in cases where the spacecraft acquired escape velocity because of a gravity assist, the boosters may not have a similar course and there is the remote possibility that they collided with something. Some objects in heliocentric orbit have been reidentified with a telescope, and so it can be confirmed that they are still there. The boosters on an escape trajectory are:

Pioneer 10 third stage, a TE364-4 variant of the Star-37 solid fuel rocket.[6]

Voyager 1 third stage, a Star 37E solid fuel rocket.[7]

Voyager 2 third stage, a Star 37E solid fuel rocket.[7]

New Horizons third stage, a Star-48 solid fuel booster, is on a similar escape trajectory out of the Solar System as New Horizons, even arriving at Jupiter by 6 hours before New Horizons. On Oct 15, 2015 it passed through Pluto's orbit at a distance of 213 million kilometers (over 1 AU) distant from Pluto.[8][9] This was nearly four months after the New Horizons probe did.[10]

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