Believing that the lack of a suitably high test platform was partially to blame for his failures, Reichelt repeatedly petitioned the Parisian Prefecture of Police for permission to conduct a test from the Eiffel Tower. He was finally granted permission in early 1912, but when he arrived at the tower on February 4th he made it clear that he intended to jump himself rather than conduct an experiment with dummies. Despite attempts by his friends and spectators to dissuade him, he jumped from the first platform of the tower wearing his invention. The parachute failed to deploy and he crashed into the icy ground at the foot of the tower. The next day, newspapers were full of the story of the reckless inventor and his fatal jump — many included pictures of the fall taken by press photographers who had gathered to witness Reichelt's experiment — and a film documenting the jump appeared in newsreels:
Tag Archives | Physics
Our universe was created after the occurrence of the Big Bang. Humans have successfully reenacted mini Big Bangs. Does this mean we could create mini universes? From The Telegraph:
The reaction created temperatures a million times hotter than the centre of the Sun, which have not been reached since the first billionths of a second following the Big Bang.
The heavyweight particle collisions follow seven months of earlier experiments crashing protons – which are 200 times lighter than lead ions – at near-light speeds.
The collisions were produced by firing lead ions – atoms with their electrons removed – at incredible speeds in opposite directions around the LHC’s underground tunnel at CERN, the European Organization for Nuclear Research, near Geneva.
This was expected to cause atomic particles such as protons and neutrons to melt, producing a “soup” of matter in a state previously unseen on Earth.
… Read the rest
Scientists, including British particle physicists, will now study the particles in the hope of discovering what holds atoms together and gives them their mass.
Interesting post from Sara Reardon in Symmetry (A joint Fermilab/SLAC publication):
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In 2008, Fermilab particle astrophysicist Craig Hogan made waves with a mind-boggling proposition: The 3D universe in which we appear to live is no more than a hologram. Now he is building the most precise clock of all time to directly measure whether our reality is an illusion.
The idea that spacetime may not be entirely smooth — like a digital image that becomes increasingly pixelated as you zoom in – had been previously proposed by Stephen Hawking and others. Possible evidence for this model appeared last year in the unaccountable “noise” plaguing the GEO600 experiment in Germany, which searches for gravitational waves from black holes. To Hogan, the jitteriness suggested that the experiment had stumbled upon the lower limit of the spacetime pixels’ resolution.
Black hole physics, in which space and time become compressed, provides a basis for math showing that the third dimension may not exist at all.
We all have our ideas about how the world and universe work. Some of us see the hand of “God” in everything. Others are atheists or agnostics—still others are guided by spirituality. But no matter where we are on the “believe” spectrum, most of us see a rather benign universe. By that I mean that we do not see specific forces struggling with one another in the cosmos once we get away from earth, which is interesting to me. We see conflict and battles on earth but not in the rest of the universe.
We view it much as we do a documentary—no plots, no dynamics—just an intriguing show. We look at ourselves—human life on earth—as being the real show. But that separation has, I believe, caused us to distort our perceptions of the Big Picture. I think if we start seeing the natural conflicts that exist in the universe, then we might start the process that leads to fewer human conflicts on earth.… Read the rest
Interesting article from Annalee Newitz on io9.com:
The US government worries that terrorists could take down the country’s electrical grid just by hitting a small node in the system. But a new study reveals the grid is too unreliable for that kind of attack.
Last year, network theorists published some papers suggesting that terrorists could take down the entire US electrical grid by attacking a small, remote power station.
But new research shows that network theory models, which great for analyzing many complex systems, don’t work for patchwork systems like the US electrical grid. Basically, the grid was set up so haphazardly that you’d have to take out a major node before you’d affect the entire thing.
… Read the rest
Science Daily sums up: [The] electric grid is probably more secure that many people realize — because it is so unpredictable. This, of course, makes it hard to improve its reliability (in another line of research, [study co-author Paul] Hines has explored why the rate of blackouts in the United States hasn’t improved in decades), but the up-side of this fact is that it would be hard for a terrorist to bring large parts of the grid down by attacking just one small part.
This is bizarre but cool that it was/is happening (feel free to mention updates on this research). Robert Matthews writes in the Telegraph:
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Researchers say Pioneer 10, which took the first close-up pictures of Jupiter before leaving our solar system in 1983, is being pulled back to the sun by an unknown force. The effect shows no sign of getting weaker as the spacecraft travels deeper into space, and scientists are considering the possibility that the probe has revealed a new force of nature.
Dr Philip Laing, a member of the research team tracking the craft, said: “We have examined every mechanism and theory we can think of and so far nothing works. “If the effect is real, it will have a big impact on cosmology and spacecraft navigation,” said Dr Laing, of the Aerospace Corporation of California.
Pioneer 10 was launched by Nasa on March 2 1972, and with Pioneer 11, its twin, revolutionised astronomy with detailed images of Jupiter and Saturn.
The future has yet to be determined, but what about the past? This recent Huffington Post piece discusses the possibility that what you do in the present shapes both future and past — “historical events such as who killed JFK, might depend on events that haven’t occurred yet.”
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Recent discoveries require us to rethink our understanding of history. “The histories of the universe,” said renowned physicist Stephen Hawking “depend on what is being measured, contrary to the usual idea that the universe has an objective observer-independent history.”
Is it possible we live and die in a world of illusions? Physics tells us that objects exist in a suspended state until observed, when they collapse in to just one outcome. Paradoxically, whether events happened in the past may not be determined until sometime in your future — and may even depend on actions that you haven’t taken yet.
In 2002, scientists carried out an amazing experiment, which showed that particles of light “photons” knew — in advance −- what their distant twins would do in the future.
The scientist has claimed that no divine force was needed to explain why the Universe was formed. In his latest book, The Grand Design, an extract of which is published in Eureka magazine in The Times, Hawking said: “Because there is a law such as gravity, the Universe can and will create itself from nothing. Spontaneous creation is the reason there is something rather than nothing, why the Universe exists, why we exist.” He added: “It is not necessary to invoke God to light the blue touch paper and set the Universe going.”...
Alasdair Wilkins writes on io9.com:
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A new theory explains the accelerating universe without invoking mysterious, unseen dark energy to account for the expansion. But it also gets rid of singularities, an unchanging speed of light … and the most famous astrophysical phenomenon of all, the Big Bang.
The observation of certain supernovas in the late 1990s led astronomers to the very unexpected discovery that the universe is expanding, and that the expansion is speeding up. There was nothing in the existing laws of physics to account for this, and so the only solution was dark energy — a mysterious force so named because we’ve never detected it, and yet it has to make up 75% of all the energy and mass in the universe for it to account for this cosmic acceleration. Also, the existence of dark energy weakens the supposedly inviolate law of conservation of energy, if not negates it completely.
… Read the rest
The possibility of going back in time only to kill your ancestors and prevent your own birth has posed a serious problem for potential time travelers, not even considering the technical details of building a time machine. But a new theory proposed by physicists at MIT suggests that this grandfather paradox could be avoided by using quantum teleportation and “post-selecting” what a time traveler could and could not do. So while murdering one’s relatives is unfortunately possible in the present time, such actions would be strictly forbidden if you were to try them during a trip to the past.
The model of time travel proposed by Seth Lloyd, et al., in a recent paper at arXiv.org arises from their investigation of the quantum mechanics of closed timelike curves (CTCs) and search for a theory of gravity. In simple terms, a CTC is a path of spacetime that returns to its starting point.