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.
they arent
The Asteroid Belt
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They were never joined to begin with.
the 4 inner planets are rock planets and the 4 outter planets are gas planets separated by the asteroid belt
compound
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.
If all planets are evenly spaced and there are 2,500 planets, they would be about 40 light years apart in the Milky Way.
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.
Colloids are mixtures where particles are dispersed but not dissolved in a medium, making them not evenly mixed but difficult to separate by filtering due to their small particle size. Alloys, mixtures of metals, can be evenly mixed but still difficult to separate due to their similar properties. Solutions are evenly mixed but can be separated if the components have different boiling points, while suspensions contain larger particles that can be separated by filtering.
The asteroid belt separates the orbits of Mars and Jupiter.