Knowledge N Fact4u

Why are stars not blurred even though the earth is moving ? •Stars are blurred when viewed from earth. We just don't notice it much with our naked eyes because of the high temporal and low spatial resolution of the human visual system. •Take a glow stick, sparkler, or flashlight and spin it very quickly in the dark. You don't see an individual object anymore, but see instead a circular blur of light. •The reason for this is that the spin rate is faster than the rate at which our eyes can discern distinct images.  •The distinct images of the object get smeared together in a process known as motion blur.  •So why don't the stars look like spinning glow sticks? The rotation of the earth does cause the stars to spin in the sky, but the spinning is much slower. •Whereas it takes the stars one day to trace out a circular path in the sky, it takes tenths of a second for the glow stick to spin in a circle.  •Our eyes can mostly keep up with the motion of the stars becau...

Imaginary numbers can then be represented as corresponding to positions on a vertical line: zero is again in the middle, positive imaginary numbers plotted upward, and negative imaginary numbers plotted downward. Thus imaginary numbers can be thought of as a new kind of number at right angles to ordinary real numbers. Because they are a mathematical construct, they don't need a physical realization; one can't have an imaginary number of oranges or an imaginary credit card bill. One might think this means that imaginary numbers are just a mathematical game having nothing to do with the real world. From the viewpoint of positivist philosophy, however, one cannot determine what is real. All one can do is find which mathematical models describe the universe we live in. It turns out that a mathematical model involving imaginary time predicts not only effects we have already observed but also effects we have not been able to measure yet nevertheless believe in for other reasons...

As per Roman Mythology, Jupiter is the god of thunder, lightning and storms. It is the largest planet in our solar system and its mass is about 2.5 times the total combined weight of all the other planets in our solar system. Now, if Jupiter would have never existed, it is safe to say that even we would not have existed. This is because some scientists believe that during the initial stages of the formation of our solar system, Jupiter's inward migration towards the sun and then subsequent outward migration away from the sun and towards Saturn played a vital role in the formation of mercury, Venus and earth. Also, since ages Jupiter has been protecting earth from collisions with large asteroids and comets. Lastly, more than 70 moons of Jupiter would have wandered along the solar system as orphans.