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Hi,

You are not seeing /spawn_model under rosnode list because it is not a normal node, it's actually a small python script that makes a service call to the /gazebo node, so it disappears when it completes its job.

If you need a more in-depth explanation, I made this video that could help:

https://www.youtube.com/watch?v=ZfVODpwVbS4&feature=youtu.be&ab_channel=TheConstruct

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