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August 9, Sutter contributed this article to Space. General relativity is one of the greatest feats of human understanding, made all the more impressive by the fact that it sprang from the fertile imagination and dogged mathematical brilliance of just one mind. The theory itself is the last and most persistent of the "classical" i.
Another testament to Einstein's genius comes in the tangled spaghetti of complex, interconnected equations that make up the full theory. Einstein made a beautiful machine, but he didn't exactly leave us a user's manual. We can trace his path in the seven years of self-inflicted torture that led to the theory's final form, but that route of development was guided by so much of Einstein's gut intuition that it's hard for us mere mortals to make the same blind jumps of genius that he did.
Just to drive home the point, general relativity is so complex that when someone discovers a solution to the equations, they get the solution named after them and become semi-legendary in their own right.
There's a reason that Karl Schwarzschild — the guy who figured out the geometry of black holes — is a household name or at least, a physics department name.
A Simplified Explanation ] Geometry is destiny The absolute core of general relativityand a perfectly acceptable alternative name for it, is geometrodynamics. Go ahead, say it out loud — it's fun.
The way that general relativity models gravity is through the dynamic machinations of space-time itself. According to the theory, the presence of matter and energy alters the fundamental space-time geometry surrounding those substances, and that altered geometry influences motion.
This relationship comes about from the most important, fundamental, can't-ignore-this concept underlying the entire theory of general relativity: This principle is the assumption that inertial mass how much oomph it takes to move an object is the same property as gravitational mass how much an object responds to gravity.
And this is the key that unlocks the whole gravitational shebang. Using that equivalence, we can imagine a scenario to help visualize the connection between geometry and gravity. Pretend you're orbiting high above the Earth, serenely watching the continents and oceans roll under your vantage point.
Then you open up a box of junk. As the bits of debris float away from you, you ponder the ramifications of what you just did.
Sure, you've now created a cloud of potentially hazardous debris that poses a major risk to satellites and future missions. But upon further reflection, your mind eases. You're doing a science experiment, and the equivalence principle guarantees that all these bits of debris, no matter their shape or mass, will perfectly trace the effects of the Earth's gravity, without the need for any other calculations.
That's something unique to the force of gravity, thanks to the E. The Evidence for Einstein's Theory ] Bending the rules Watch what happens to the junk you tossed into space. Some, by pure chance, may start off in a perfectly horizontal line. But as the objects fall to Earth, they follow straight lines heading right for the center of the globe.
If you watch them closely, you'll see that as they head downward, they'll gradually converge. If they could pass through the solid Earth, they would eventually collide at the very center. Other bits of junk might start off in a perfectly vertical line aimed toward Earth, evenly spaced apart from each other.
They, too, would fall. But the lucky one at the front of the line would fall slightly faster, due to its slightly closer proximity to the Earth, with the last in line lagging slightly behind. So, as the pieces of debris continued their descent, they would slowly diverge in their vertical line.
In some cases, we get converging, narrowing trails.
In other cases, we get diverging, spreading trajectories. In both cases, paths start out as perfectly parallel or uniform but change character s.Recreational mathematics by Dr.
Gerard P. Michon. Fun questions can help demonstrate useful mathematical tools. Classic puzzles and riddles. NEW YORK, BRONX (USA). The Department of Pathology at Montefiore Medical Center, the University Hospital for Albert Einstein College of Medicine, Bronx NY, is actively seeking a neuropathologist for a full-time academic anatomic pathology position, which may be combined with surgical pathology or autopsy responsibilities, including autopsy service directorship.
Watch video · This exercise will help you visualize Einstein hundred years is a constant reminder of just how dang smart Albert Einstein was. possible destinations that the object could reach traveling.
Albert Einstein (14 March – 18 April ) was a German-born theoretical physicist who developed the general theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).
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