The nodes and chests despawn 10 or 15 seconds after being gathered/opened. Everybody doing the route at roughly the same time can get them.
The popular Earth's rocket yard loop can get crowded for sure. While farming fallen kills for queen bounties the last couple days, I've established a loop on the moon that works for me. I've got a spot on Venus I'm figuring out. Mars is a pain because the material blends in so well.
It just takes some time in an are on each planet to learn where chests and nodes may spawn.
Edit:had my planets mixed up.

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