It seems to be a weird question that "Is this world real?" Why it seems to be too real? Because we see it, isn't it? We see things exist and happen as time flows. Besides seeing, we also hear, touch, smell and taste to realize our surroundings. Thus, we say "there it is" or "that is happening". Think if you had no eye, nose, ear, tongue or feeling of touch or pain; then, you would be very helpless. Why? Because you would not be able to sense anything then. Surprisingly, you won't be able to say how the world around you is. You have to have those parts of your body to realize the truth or experience the reality. Now, what are the functions of those parts? Simply they are sensitive to stimuli (such as light, smell, sound etc.) and those stimuli make nerve impulses that are carried by sensory nerves to your brain. In conclusion, what your brain experiences make an image of 'reality' and you simply believe that without confusion. ...
Black hole. what is that thing. most of us have heard about this. but have you the correct concept of what is that thing really is? If not don't worry . Black whole can normally be said as a black coloured hole in space. wait , a hole in space? how can it be possible? yes its true . its a hole in 3d space caused by infinte mass of a sphere which has a volume of infinitely less than 1 ,i.e., (1/∞). but not 0. When a star which has mass of about 20 times of that of sun, it becomes a blackhole after death. the process of being black hole is so complicated than I cannot write it all here . But I will give the basic concept(at least I'll try). You should be aquinted with a term named schwarzschild radius . If an object is shrinked into its schwarzschild radius it will be a black hole. schwarzschild radius is directly proportional to its V or volume. In fact in quantum world a lot of black hole birthing but they are too small and too less stable to harm us....
Four-dimensional geometry is Euclidean geometry extended into one additional dimension . The prefix "hyper-" is usually used to refer to the four- (and higher-) dimensional analogs of three-dimensional objects, e.g., hypercube , hyperplane , hypersphere . -dimensional polyhedra are called polytopes . The four-dimensional cases of general -dimensional objects are often given special names, such as those summarized in the following table. 2-D 3-D 4-D general circle sphere glome hypersphere square cube tesseract hypercube equilateral triangle tetrahedron pentatope simplex polygon polyhedron polychoron polytope line segment plane hyperplane hyperplane square octahedron 16-cell cross polytope polygon edge face facet facet area volume content content The surface area of a hypersphere in dimensions is given by (1) where is the gamma function , giving the first few values as (2) (3) (4) (...
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