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Editor: Pavan Kumar

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Light - is It a Wave or a Particle? Wave–particle duality!

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Wave–particle duality is the concept in quantum mechanics that every particle or quantum entity may be described as either a particle or a wave. It expresses the inability of the classical concepts "particle" or "wave" to fully describe the behaviour of quantum-scale objects. Can we accurately describe light as exclusively a wave or just a particle? Are the two mutually exclusive? In this third part of his series on light and color, Colm Kelleher discusses wave-particle duality and its relationship to how we see light and, therefore, color. You look down and see a yellow pencil lying on your desk. Your eyes, and then your brain, are collecting all sorts of information about the pencil: its size, color, shape, distance, and more.  But, how exactly does this happen? The ancient Greeks were the first to think more or less scientifically about what light is and how vision works. Some Greek philosophers, including Plato and Pythagoras, thought that light originated in ou...
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What is the fastest man made object ever recorded?

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Speeed of Light : The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light. In  miles per hour , light speed is, well, a lot: about 670,616,629  mph As an object approaches the  speed of light , its mass rises precipitously. If an object tries to  travel  186,000 miles per second, its mass becomes infinite, and so does the energy required to move it. For this reason, no normal object  can travel  as fast or faster than the  speed of light Fastest man - made object ever : The Parker Solar Probe just earned the title of the fastest-moving manmade object. Launched by NASA this past August 2018, this robotic spacecraft is currently very, very near the Sun, on its way to probe the outer corona of our local star. The Parker Solar Probe is a NASA robotic spacecraft launched in 2018 with the mission of making observations of the outer corona of the Sun. It will approach...
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The Fermi Paradox !

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The Fermi Paradox seeks to answer the question of where the aliens are. Given that our star and Earth are part of a young planetary system compared to the rest of the universe — and that interstellar travel might be fairly easy to achieve — the theory says that Earth should have been visited by aliens already. S ome people stick with the traditional, feeling struck by the epic beauty or blown away by the insane scale of the universe. Personally, I go for the old “existential meltdown followed by acting weird for the next half hour.” But everyone feels something.Physicist Enrico Fermi felt something too—” Where is everybody ?” On the very best nights, we can see up to about 2,500 stars  and almost all of them are less than 1,000 light years away from us but what we are actually looking at is a very tiny patch of the Milky way galaxy.The observable universe is very vast and consists of more than     10 24  stars. Out of those 500 quintillion sun like stars a...
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