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So what good would Einstein ( EFE )'s equations be if there weren't some practical consequences as can be shown from astronomical observations?
Here we delve into answering some practical questions such as the following; or, at least "practical" insofar as astronomers try to discern answers to some vexing yet deeper problems which really only so far has Einstein's EFE equation been able to provide solutions:
1). Mercury's Perihelion Advance in its orbit around the Sun;
2). General Relativity: Deriving Newton's Laws of Motion and Gravity;
3). Gravitational Time Dilation and Red ( Spectral Line ) Shift ... this gets into gravity lensing;
4). Gravitational Waves now newly discovered since September 2015 will in the very near future proffer another alternative yet extremely powerful means besides optical and radio telescopes to probe deepest space;
5). Finally, but the very least not to be forgotten, Black Holes: Masters of the Universe!
Ring of Fire: First Ever Black Hole Image Captured - April 10, 2019
Larger than our entire Solar System, this monster super massive black hole was found in galaxy M87 300 million trillion miles away!
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