Was there a planet between Mars and Jupiter at some time?
There is far too much circumstantial evidence that there must have been one.
The orbits of the planets have a geometric sequence in terms of distance from the sun. But just after Mars, the distance to Jupiter is TWICE the distance it should have been.
And in the place where there should have been another planet, there IS an orbit. The asteroids follow this orbit. Asteroids are millions of pieces of rock and dust. Is it that they are the remains of a planet that was there, and has blown up?
Were there an advanced species there? Did they get too advanced for their own good?
Did some of them manage to space travel?
Are we their descendants?
Why are we the weakest species on this planet? Why are we so different in all aspects from the other animals on earth?
And being the weakest physically, how come we have evolved way beyond all of them? Logically we should have been the last to evolve...