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You don't have to watch his channel for very long to learn that he often does (see his video about the recent gravitational wave detection [1], plus a bunch more).

[1] https://youtu.be/iphcyNWFD10

Just by sharing the news he is working with them helping the global effort.

Because he’s busy making physics more approachable through videos.

Perhaps I should have phrased it as "why don't astronomers work with _him_?"