Scientists have not developed any theories about God's creation. They investigate the natural world and its origins, but have found no evidence that would require involvement of God (or gods) in the origin of the world.
they believe our solar system was formed by the big bang
Not exactly, it is a theory about the origin of the Universe; which does include the Solar system...
by a theory of the BIG BANG explosion and the HELIOCENTRIC theory,that until now is being believe
Nasa
the nebular theory
scientists can use them to study the early solar system
Yes, it is. At 2006, the scientists decided that it was not a planet of solar system. Now, there are just eight planets in the solar system.
nebular theory
That was Galileo.He advocated the heliocentric theory of the solar system,proposed by Copernicus.
The most important force during the creation and formation of a new solar system is gravity. Even before the system's creation, gravity aggregates the gases and dust to form the star that will become the system's sun.
Scientists can use them to study the early solar system.