Check out The Generalist Academy for an interesting thing every day. I probably check in once or twice a week. Loved the recent post Rubble Moon. “The Martian moon Phobos is thought to be a pile of rubble that’s nearly a third empty space inside. It circles its planet twice a Martian day, and in a few million years it will disintegrate into rings.”
There’s also a brief mention of the nearly 300 foot tall monolith on the surface of Phobos.