What are you wondering?
No one has brought home a piece of a star. So how do we know?
No one has traveled to Earth’s center. So how do we know what is there?
No human saw a dinosaur alive. So how do we know they existed?
If Earth is moving, why can’t we feel it? And how do we know it moves?
What if the planet is too faint to see? How do we find it?
Africa and South America look as though they might fit. Is that enough?