Nick Cook – A Ramble Through an Oxford Author's Imagination and Inspiration

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Showing posts with label Physics. Show all posts
Showing posts with label Physics. Show all posts
Nikola Tesla – Forgotten Genius
08:41

Nikola Tesla – Forgotten Genius
“Let the future tell the truth, and evaluate each one according to his work and accomplishments. The present is theirs; the future, for which I have worked, is mine.”
– Nikola Tesla
They say that the history books are written by the winners. Maybe that’s one of the reasons most people aren’t that familiar with the name Nikola Tesla. He was a Serbian-American born during a lightning storm in the 19th century, and was a true genius in every sense of the word.

Ask someone who invented the light bulb and they’ll probably come up with the name of Tesla’s great rival, Thomas Edison. The irony is that Edison didn’t actually invent the light bulb – in fact he perfected the work of others to develop a more reliable and commercial design. Tesla and Edison, great rivals, fought directly for supremacy in the way electricity was distributed. Okay, maybe this doesn’t sound as significant as the invention of the light bulb, but it’s just as fundamental to our modern world.

Towards the end of the 19th century, a fierce battle was raged for the future of electrical distribution by the two scientific giants, Edison in the corner supporting direct current (DC), and Tesla in the other championing alternating current (AC). Despite Edison’s significant campaigning for the adoption of the DC system (which included electrocuting animals to prove how dangerous AC was), there’s a major problem with DC – over any significant distance it’s hugely inefficient. If the world had adopted Edison’s approach we would have needed countless hundreds of thousands more power stations than we have today. Thankfully, Tesla’s much more efficient AC system won through and it’s that which forms the backbone of modern electricity distribution grids.

It might be understandable if the world had overlooked Tesla for this single contribution to humanity, but his talents didn’t stop there. There are numerous areas that Tesla pioneered, including: radio, radar, x-rays, hydeo-electric generation, the modern electric motor, recording of radio waves from space, even early experiments in cryogenic engineering. The list goes on and on. In other words Tesla was a true genius in every sense of the word.

Tesla had an astonishing mind and was a true visionary, not bound by current thinking and trends. An example of this maverick approach is one of his final inventions where he experimented with wireless power. Tesla constructed the Wardenclyffe Tower, a device intended to use the Earth and its ionosphere as giant electrical conductors. To realise this extraordinary idea, Tesla intended that receiving stations would be constructed around the world which could draw power from this wireless power grid. This might sound like an absurd concept, but many took it seriously including financier, J.P. Morgan, no less. He helped to fund Tesla’s experiments, but despite early promise, the development work proved prohibitively expensive, and during the stock market crash of 1901, Tesla’s funding dried up. It it hadn’t, maybe our world would be very different today, with power beamed into our homes and vehicles. It sounds crazy, but who knows, maybe in the future someone may go on to prove the feasibility of Tesla’s early pioneering work.

So why do we remember Edison but not Tesla? It’s a good question. Maybe it’s because he laid the ground work that others capitalised on to the point that they are credited with their invention. Also, whilst Tesla’s contemporaries enjoyed huge financial success (and some might say were better businessmen), Tesla died alone and broke in a New York hotel room. Maybe, this underlines that he was more an ideas man, rather than someone concerned with commercially exploiting his inventions.


Whatever one believes about Tesla’s life, without doubt he made a major contribution to scientific progress. Certainly, if he hadn’t have lived, we would have felt the impact on our modern world. But at least now we are starting to recognise the significance of Tesla’s contribution and how his genius touches all our lives to this very day. At the very least, we owe him a debt of gratitude. 
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Part of the Universe is Missing – A Big Part!
07:49

Part of the Universe is Missing – A Big Part!
"Knowledge of what is does not open the door directly to what should be."
– Albert Einstein 
(Image Credit: NASA)
There’s a search going on that started at the beginning of the 70’s, when observations revealed that something wasn’t quite right with the universe – part of it was missing! 
The reason that we know it’s there is because of its effect on what we can actually see. To start with the stars at the edge of galaxies are moving to fast, there seems to be extra stuff exerting an influence. This stuff might be invisible but we know it's there. If it wasn’t there there wouldn’t be enough gravity to hold the stars together and everything would fly apart and chaos on a galactic scale would ensue.
Another piece of smoking gun evidence, is an optical effect observed around some distant galaxies. When the Hubble Space Telescope was pointed towards the massive Abell Cluster 2218, the gravity pull around it was so great it actually bent light around it, turning the whole region into something known as a gravitational lens. Using this technique Hubble was actually able to see through it, regions at the very edge of the universe. It took some amazing images such as the one above, stuffed full of galaxies. However, once various measurements were taken, it was soon realised that the light was being bent too much. In other words the combined mass was greater than anything that we could measure, meaning a lot of the mass was invisible. As far as dark matter is concerned we believe to be around 25 percent of the mass of the universe.
So what could dark matter be? The best guess is that it’s some sort of exotic hidden particles we are yet to discover. 
But this isn’t all that’s missing. There’s another 70 percent lost back down the back of the galactic sofa and we have labelled this dark energy. We have even less idea about what this could be. We are just starting to understand that space isn’t nothing, but is instead a rich area stuffed full of dark energy, whatever it might be.
So if you do the sums, that means there’s 5 percent that we can see and currently understand. That’s the observable universe today. So when you see those Hubble images, etc, we really are just seeing the peek of a very big iceberg, the rest floating beneath the visible waterline.
The below YouTube video provides a very neat overview of all this missing stuff.




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Songs of the Universe
07:19

Songs of the Universe
"The world is never quiet, even its silence eternally resounds with the same notes, in vibrations which escape our ears. As for those that we perceive, they carry sounds to us, occasionally a chord, never a melody."
– Albert Camus 
(Earth Image Credit: NASA)
Out there in the space as they say, no one can hear you scream... and that will be because of the vacuum. However, radio waves can happily pass through that medium and radiate out across the galaxy. 
If you’ve ever seen static on a TV screen did you know that you’re actually tuning into the white noise of the universe, the static that fills the radio waves between our broadcasts. Listen to the pops and whistles from the audio output of a radio telescope and you may hear Jupiter and its moons, our sun's wail, the distant clicking of pulsars, and even the echo of the big bang itself.
Inspired by this, I’ve assembled a little YouTube celestial orchestra for you to listen to. The gas planets are majestic and Earth sounds truly unique buzzing with the sound of life. And further, much further away, you can listen to the clicking of the spinning pulsar at the heart of Vega. These are just a selection of the haunting sounds that fill the universe around us.








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Beyond The Edges of Our Perception
07:25

Beyond The Edges of Our Perception
"Why does the eye see a thing more clearly in dreams than the imagination when awake?"  
– Leonardo da Vinci
I’ve talked before about how reality is a subjective matter at the best of times. Well here’s another thought for you to consider.
We see the world around us in the visible spectrum of light. All those shapes and colours around us, when combined with our other senses, sum up the real world. But what about a creature like a bat with its poor eyesight and that's almost totally reliant on its ability to map out the world with ultrasound echoes? To a bat, a soundscape is their reality. Just consider the implication of that for a moment, to mentally see the world as a construct of echo feedback.
At first, the bat's view may seem like a very narrow view of what's really there to us, but the irony is that in many ways humans are as limited as bats are with their senses. The visible wavelength we see is just a tiny fraction of the total electromagnetic spectrum. 
To get this into perspective it’s important to realise just how a narrow a window we’re peaking out at reality through. Visible wavelengths are just 0.00018% of the total spectrum available. Talk about a blinkered view of reality. Maybe out there in the universe, there are lifeforms equipped to see the world across wider frequencies such as radio waves, gamma rays, or X-rays. Imagine how limited our vision would seem to them.
Without the insight, that science has given us into these other wavelengths, in our own ways humans are just as blind as bats. 
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Higgs Boson – The Treacle of the Universe
05:17

Higgs Boson – The Treacle of the Universe

“The capacity to be puzzled is the premise of all creation, be it in art or in science.”
– Eric Fromm
One second after the big bang a particle was created and has been playing a game of hide and seek ever since. The reason we know it should exist is that there’s a piece missing from our jigsaw for the Standard Model of physics – the Higgs boson particle. Now a lot of people are very fond of our Standard Model and a jigsaw just doesn’t look complete if there’s a big glaring hole in it. So ever since the idea was first suggested, the search has been on for the elusive God Particle
The theory, which has been around for fifty years, states that moments after the big bang the Higgs boson field and its associated particle were created, but until now we’ve found no direct evidence. That’s all changed in 2011 when news from the Large Hadrian Collider (LHC), where we can recreate those early conditions of our universe, hinted at its detection.
Without Higgs boson in the Standard Model there would be no life... symmetry would rule, a desire for order you see reflected in the perfect structures of snowflakes. But without something to give particles mass and slow them down, the Higgs boson field, our celestial treacle if you will, things would be very, very different. All particles would have flown apart at the speed of light from the big bang and without the clumping of interstellar gasses and the consequent formation of stars, then there would be no planets and certainly no life. This is the paradox at the heart of modern physics and is why so many scientists have been spent so much time and energy looking for it.

This year could be the most exciting moment in physics since Einstein revealed his theory of relativity. Certainly I’m sure for many of those involved in theoretical physics, they’ll remember exactly when they were if they hear the news confirming the existence of the Higgs boson particle later this year. 

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In the Universe's Shadow
05:30

In the Universe's Shadow
“It turns out that an eerie type of chaos can lurk just behind a facade of order - and yet, deep inside the chaos lurks an even eerier type of order”
– Douglas Hostadter 

In the TED video above, George Smoot talks about the design of the universe. What becomes clear is that for all the appearance of randomness from our perspective here on Earth, when computer modelling is thrown into the mix, an underlying order is quickly revealed. 


This is particularly clearly illustrated by Smoot's image of dark matter. This is the hidden ingredient in the cake recipe for the universe. We know this "thing" exists and can indeed see its effect around distant galaxies where light is bent around their edges (forming a gravitational lens to view even more distant galaxies). There is not enough matter in a galaxy to bend light as much as observed, and we’ve labelled this missing mass dark matter.

The mapped image of dark matter is breathtaking. It shows that the design for the universe is far from chaotic and has a very ordered underlying filament-like structure. This is a recurring fractal pattern seen in nature, from the branches of a tree, to the bronchioles of lungs. However, to see this in our universe you need to zoom right out. Quantum physics deals with the very small. The scale we're talking here is exactly the opposite, the physics of the very, very large. When you consider the measurements that George Smoot is talking about, the scale of the universe alone is jaw-dropping. Each tiny node in his image are entire galaxies (there hundreds of billions in our universe).
It seems that the data is telling us that the empty stuff out there, the void between galaxies is filled with order. I personally find that an inspiring thought.



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