How have the ideas about the structure of the solar system changed since hundreds of years ago?
There have been many changes to the model of our solar system.
Hundreds of years ago, people thought the Earth was at the center of the universe. Ptolemy came up with a model for this.
This is the geocentric model.
A few hundred years ago, a greek astronomer came upon the idea of the sun being in the middle. That model was the heliocentric model. Copernicus then thought that this was true and then added the planets in.
Then, Kepler came along and found that the orbits of the planets were not elliptical. This founded our current model of the solar system.
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The ideas about the structure of the solar system have evolved significantly over the past few hundred years. Initially, the geocentric model placed Earth at the center with the Sun and other celestial bodies orbiting around it. This model was later replaced by the heliocentric model proposed by Copernicus, which correctly positioned the Sun at the center with planets orbiting around it. Further advancements in astronomy, such as Kepler's laws of planetary motion and Newton's law of universal gravitation, refined our understanding of the solar system's structure and dynamics. Today, we have a detailed understanding of the heliocentric model, with the Sun at the center, planets in elliptical orbits, and various other celestial bodies like moons, asteroids, and comets orbiting the Sun.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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