This was a single ship, but I've heard that a fleet of ships arrived and that's what needed to be hidden from the public (one ship can be written off as a strange, solar process we don't understand... but seeing it repeated dozens of times would set off alarm bells.)
Here's a video link of the type of event that was supposedly covered up by shutting down the telescope:
https://www.reddit.com/r/conspiracy/comments/xwc665/aliens_exist_in_front_of_everyone_nasa_knows_the/
This was a single ship, but I've heard that a fleet of ships arrived and that's what needed to be hidden from the public (one ship can be written off as a strange, solar process we don't understand... but seeing it repeated dozens of times would set off alarm bells.)