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Do you really understand Einstein’s theory of relativity?

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  Albert Einstein's theory of general relativity completely changed the notion of the Universe.  It shed light on the birth of the universe, planetary orbits, and black holes.  It also has very practical uses, like GPS navigation.  But what exactly is this theory and why was it so revolutionary?  Until the early 20th Century, physics was mostly explained in terms of Isaac Newton's  laws. For Newton, gravity was a force generated  by the mass of an object causing them to attract each other,  heavier objects pulling others more intensely. This is why we stand on the ground on Earth,  said Newton… it attracts us to its center.  And it’s why planets move around the Sun. But imagine if the Sun disappeared completely.  According to Newton's theory, the planets of the Solar System would instantly  abandon their orbits, as there would be no gravity attracting them to the Sun.  For Newton, gravity is a force with immediate action ...
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Black Holes Explained – From Birth to Death.

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 Black holes are one of the strangest things in existence.  They don't seem to make any sense at all.  Where do they come from...  ...and what happens if you fall into one?  Stars are incredibly massive collections of mostly hydrogen atoms  that collapsed from enormous gas clouds under their own gravity.  In their core, nuclear fusion crushes hydrogen atoms into helium  releasing a tremendous amount of energy  This energy, in the form of radiation,  pushes against gravity,  maintaining a delicate balance between the two forces.  As long as there is fusion in the core,  a star remains stable enough.  But for stars with way more mass than our own sun,  the heat and pressure at the core allow them to fuse heavier elements  until they reach iron.  Unlike all the elements that went before,  the fusion process that creates iron  doesn't generate any energy.  Iron builds up at the center of the ...
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Time is Relative

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 Is time moving faster we've all heard  the cliche phrase but according to  physics time is actually moving slower  100 years ago we believed that time was  the same for everyone and everything we  were all participating in the same ticks  of the clock every interval of time was  the same as the one before and it moved  forward in a linear uniform progression  however in 1919 Albert Einstein  demonstrated that time is relative with  a theory of special relativity he  discovered that time slows down or  speeds up depending on how fast you move  relative to something else we know that  when you travel faster for instance time  moves slower this is something NASA has  had to account for in their satellites  which move around the Earth at 29,000  km/h the clocks onboard each satellite  ticked slower than identical clocks o   the ground by about 38 microseconds per  day each mic...
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