Observations of the solar system support the nebular theory because the planets and sun rotate in different directions comets fly very close to the sun, pulling matter away from it all the planets orbit the sun in the same direction along a circular, flattened disk elements such as hydrogen and helium remain in the solar system

The nebular theory is the justification for the creation of solar systems. What the theory explains are three facts – first fact is that all the terrestrial planets, which are those within the orbit of the Asteroid Belt, are rocky, while those outside it are gaseous. Second fact is that they all orbit within 6 degrees of a common plane. And lastly, is that the planets all rotate in the same direction. The last fact is the reason why the nebular theory is supported. Therefore, the correct answer is all the planets orbit the sun in the same direction. (and roughly on the same plane.)

The name may be in importnce  to them