Editing General Relativity (section)

== <span style="color: #FFFFFF;">Understanding</span> ==
General Relativity replaces Newton's universal law of gravitation with a geometric framework.

'''The Geometric Intuition''': Imagine a stretched rubber sheet. Placing a heavy ball (a star) on it creates a dip. If you roll a smaller ball (a planet) near it, the planet will follow the curve of the dip. Gravity is not a "pull," but the natural path taken through a curved geometry.

'''The Field Equations''': Expressed compactly as Gμν + Λgμν = (8πG/c⁴)Tμν. The left side describes the geometry (curvature), and the right side describes the energy and momentum of matter. Solving these equations for various conditions yields the structures of our universe: the expansion of space (Friedmann equations), the behavior around stars (Schwarzschild solution), and the nature of rotating bodies (Kerr solution).

'''Time and Gravity''': One of the most counter-intuitive predictions of GR is that gravity affects the passage of time. Clocks at sea level run slightly slower than clocks on top of mountains. This is not a mechanical effect, but a property of the spacetime fabric itself. Without correcting for this, GPS satellites (which experience weaker gravity) would drift by kilometers every day.
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