They were never joined to begin with.
The Asteroid Belt
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the 4 inner planets are rock planets and the 4 outter planets are gas planets separated by the asteroid belt
The inner planets and outer planets are separated by the asteroid belt, which lies between Mars and Jupiter in our solar system. The inner planets are Mercury, Venus, Earth, and Mars, while the outer planets are Jupiter, Saturn, Uranus, and Neptune.
Mars and Jupiter.
The inner planets (Mercury, Venus, Earth, Mars) are separated from the outer planets (Jupiter, Saturn, Uranus, Neptune) by the asteroid belt, a region of space located between the orbits of Mars and Jupiter. The asteroid belt contains millions of rocky objects that range in size from small boulders to dwarf planets.
The asteroid belt separates the orbits of Mars and Jupiter.
A: To our solar system the distance is great But compared the the universe it is inches away
The inner planets of Mercury, Venus Earth & Mars - are 'separated' from Jupiter, Saturn, Uranus & Neptune - by the asteroid belt.
Because there is no reason for them to be evenly separated. You're starting with the assumption that they SHOULD be evenly separated, and looking for a reason why they end up being something other than they should be. Your assumption is faulty. And so your question is meaningless.
Well because 1. Pluto is too small and 2. its made of/covered with ice.
Mars is one of the inner planets as well as Mercury, Venus and Earth. It is separated from the other planet by the Asteroid Belt.