Go look at them and see for yourself, then you will know. Of course it may be that the light bends over the horizon by gravity and all you need is cool telescope to see forever.
Ever look down a railroad track? We are limited on what we see by many factors but perspective is a big one.
You are kidding right? So Nikon makes a camera lens that can see through the earth? That’s what is going on when something is below the horizon. You can’t see the object because the earth is literally in between you and the object so unless this camera can see through mountains then it can’t see things below the horizon. If you believe the Earth is flat then you can easily believe the moon is made of cheese. There is equal evidence of both.