Mars is smaller than expected
When the Sun's protoplanetary disk is simulated on a computer, it shows Mars as larger than it is due to a greater level of mass near the planet's orbit. The Grand Tack Hypothesis supposes Jupiter absorbed much of this mass.
The asteroid belt's object mix
The existence of icy objects and dry, rocky objects within the asteroid belt has challenged astronomers. The Grand Tack claims Jupiter's outward migration pushed the belt in, and deflected icy objects toward the Sun.
Earth has the “right” amount of water on its surface
The classical model of the Solar System's formation shows Earth with too much or too little water. The Grand Tack supposes C-type, icy asteroids were the source of water.
The asteroid belt doesn't have as much…
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All About Space Book of the Solar System (Digital) - 1 Issue, All About Space Book Of The Solar System 4th Edition