UFOs: No Longer Crazy?

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"In astrophysics, an event horizon is a boundary beyond which events cannot affect an observer."

https://en.wikipedia.org/wiki/Event_horizon

Then how can we observe the goings on beyond the event horizon that encloses our solar system?

My red bold.

Events within the boundary do not affect the observer outside and beyond the boundary. For example, the gravitational effect within the event horizon of our solar system will have no effect on an observer outside the event horizon of our solar system. The further you travel away from mass, the less gravitational effect it will have. Eventually you will travel away from it far enough that its gravity has little or no effect upon you. That is when you have gone beyond the event horizon.

In the context of this discussion, the "event" is the gravitational effect of our solar system.