In 1766, Johann Titius, and then in 1772, Johann Bode,
proposed similar versions of what became known as the TitiusBode law.
This law "predicted" the spacings of planets' orbits around the Sun, as
follows:


































































One can even develop a formula for this "law": after Mercury, "double" the number, add 4, and divide by 10:
Is this a law of physics on par with Kepler's laws and Newton's laws? How would we determine this? This "law" predicts the existence of planets at 2.8 and 19.6 AU.
... the discovery of Uranus ...