My Physics Life

[Gy3f]

How did you find PF?

I am here because of recommendation.

I am always thrilled about physics, and science in general. It shows me details of everything. I want to know how things work. I have been reading physics my materials for great knowledge. Then I also try to discover some.

 

[jedishrfu]

Welcome to PF!

It's great that you are interested in physics and science. One thing I learned about Physics is to be careful about the physics information contained in popular science books. Sometimes, they use analogies that don't work as you dig deeper.

As an example:

The famous one is the rubber sheet description of gravity, in which a bowling ball represents the Sun and a marble represents a planet. Depending on how you roll the marble, it will circle the Sun and eventually fall into it.

It's misleading because it relies on gravity to explain gravity, only represents 2D curvature, while real spacetime is 4D, and overlooks time dilation. It falsely suggests that objects “fall in” due to a dip instead of following geodesics and fails to clarify how gravity bends light.

A better understanding comes from recognizing that gravity alters both space and time, directing objects along curved paths in a self-contained, four-dimensional spacetime without requiring an external force or higher dimension.

 

[Gy3f]

Well, jedishrfu, your point is very interesting. Warping of space time by Einstein is proved by observations before deductions. What have you observed, before making your deduction?

 

[PeroK]

Well, jedishrfu, your point is very interesting. Warping of space time by Einstein is proved by observations before deductions. What have you observed, before making your deduction?

You can't observe curved spacetime. That is part of the mathematical model. What you can observe is the motion of objects or the detection of light rays as predicted by the the mathematical model.