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How many SpaceX 2nd stages are in heliocentric orbits?

I'll supplement @KarlKastor's "4" answer and highlight some future missions at the end that will up the total: 4 Past missions According to Wikipedia, the Triana (also known as DSCOVR or ...
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Is it true that 18SPCS is "not really concerned with tracking deep-space debris like" the Chang’e 5-T1 rocket body that hit the Moon?

I think the 18SPCS will track what they need to in order to focus on their national security mission. Certain space objects will remain classified, yet others can track the object. It's more of the ...
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