Tycho Brahe made very accurate observations of the solar system. Brahe's assistant, Johannes Kepler, used the observations to figure out the shape of the planets orbits. When he used circular orbits, his calculations did not fit the observations. But after years of detailed calculations, he found that the orbit of each planet is called an ellipse. An ellipse is an oval shape.
Not exactly, it is a theory about the origin of the Universe; which does include the Solar system...
the nebular theory
nebular theory
That was Galileo.He advocated the heliocentric theory of the solar system,proposed by Copernicus.
big bang theory
Catastrophic theory of the solar system suggests that major disruptions or events in the past, such as collisions or close encounters with other celestial bodies, played a significant role in shaping the current structure of our solar system. This theory contrasts with the gradual, slow processes of traditional solar system formation theories.
The Nebula Theory is also known as the Solar Nebula Theory. It is a widely accepted model for the formation of our solar system.
The Heliocentric Theory states that the Earth and planets revolve around a stationary Sun at the center of the solar system. The Sun is the center of the Solar System.
The Heliocentric picture of the solar system is a model because it was given as a theory by Copernicus to describe the solar system. In prior centuries people believed that the earth was the center of the solar system.
As proposed by the Heliocentric Theory, the Sun is the center of the Solar System.
Geocentricism.
The heliocentric theory was first published by Copernicus.