Never thought astronomy could be so cute.

(via likeaphysicist)

Never thought astronomy could be so cute.

(via likeaphysicist)

Mandatory reading for anyone interested in modern physics, the vision of one of its main precursors,

, interviewed byPaul DiracThomas KuhnandEugene Wigner, nothing less.About Dirac I always recomend this wonderful book from Graham Farmelo: The Strangest Man: The Hidden Life of Paul Dirac, Mystic of the Atom, and alternatively, this conference by the author:

45 years ago today these three men inspired the world with their bravery, skill and example; Thanks Mike, Buzz and Neil.

(via scarligamerluss)

Quantum bounce could make black holes explode

If space-time is granular, it could reverse gravitational collapse and turn it into expansion.One of the leading approaches to merging quantum theory and gravity, pioneered by, among others, theoretical physicist Carlo Rovelli of Aix-Marseille University in France, posits that it is not just gravity but space-time itself that is quantized, woven from tiny, individual loops that cannot be subdivided any further. The loops in this ‘loop quantum gravity’ — a theoretical attempt that has yet to find experimental support — would be so tiny that to any observer space-time looks smooth and continuous. In the new work

^{1}, Rovelli and his Aix-Marseille colleague Hal Haggard have calculated that the loop structure would halt the collapse of a black hole.The collapsing star would reach a stage at which its inside can shrink no further, because the loops cannot be compressed into anything smaller, and in fact they would exert an outward pressure that theorists call a quantum bounce, transforming a black hole into a white hole. Rather than being shrouded by a true, eternal event horizon, the event would be concealed by a temporary ‘apparent horizon’, says Rovelli. (Theoretical physicist Stephen Hawking of the University of Cambridge, UK, has recently suggested that true event horizons would be incompatible with quantum physics.)

CERN announces LHC restart schedule:

2 June 2014 -Restart of theProton Synchrotron Booster18 June 2014 -Restart of theProton Synchrotron(PS)Early July -Powering tests at theSuper Proton Synchrotron(SPS)Mid-July -Physics programme to restart at theISOLDEfacility and at the PSMid-August -Antimatter Physics programme to restart at theAntiproton DeceleratorMid-October -Physics programme to restart at the SPSEarly 2015 -Beam back into theLarge Hadron Collider(LHC)Spring 2015 -Physics programme to restart at the LHCexperiments

(via spherical-harmonics)

I was an ordinary person who studied hard.

(via writtenblock)

By all accounts, we’re given to believe that the jets of the future will be pretty cool. DARPA says they won’t need runways or even pilots, while NASA wants to fly at supersonic speeds without the problem of sonic boom. Meanwhile, explorers are trying to circumnavigate the world on solar power, and researchers are working to control planes with their minds.

via xkcd

Turns out Earth has a lot of our solar system’s ground. Really puts into perspective how much smaller Mars is!

The towers will be built in the city of Wuhan in China, with one slightly taller than the other. With a planned height of almost a kilometre, the tallest of the pair will edge out the Burj Khalifa in Dubai as the tallest building in the world.

They’ll also be two of the most environmentally friendly buildings ever made. According to Adele Peters at FastCompany, the pair will be built on an island, and the larger tower will be responsible for ‘feeding’ sustainable power to the smaller tower. It will also be responsible for cleaning its surroundings by pulling water up out of the lake, cleaning it, and then putting it back.

“The water goes up through a series of filters,” said Laurie Chetwood, chairman of UK-based Chetwoods architect firm in charge of the project. “We don’t use power to pull the water up, we’re using passive energy. As it goes through the filters and back, we’re also putting air back into the lake to make it healthier.”

"The towers also have pollution-absorbing coatings to help clean the air, vertical gardens that filter more pollution, and a chimney in the middle of the larger tower naturally pulls air across the lake for better ventilation. Wind turbines, lightweight solar cladding, and hydrogen fuel cells running on the buildings’ waste will generate all of the power used by the towers, plus a little extra for the rest of the neighbourhood."

Once approved by the city’s mayor, construction is planned to start at the end of the year, with a completion date of 2017 or 2018.

(Source: upworthy.com, via spherical-harmonics)

Don’t just read it; fight it!Ask your own questions,

look for your own examples, discover your own proofs.

Is the hypothesis necessary? Is the converse true?

What happens in the classical special case? What

about the degenerate cases? Where does the proof

use the hypothesis?—- Paul R. Halmos [x]

For the ever-shrinking transistor, there may be a new game in town. Cornell researchers have demonstrated promising electronic performance from a semiconducting compound with properties that could prove a worthy companion to silicon.

'Cosmic own goal' another clue in hunt for dark matterThe hunt for dark matter has taken another step forward thanks to new supercomputer simulations showing the evolution of our “local Universe” from the Big Bang to the present day.

Physicists at Durham University, UK, who are leading the research, say their simulations could improve understanding of dark matter, a mysterious substance believed to make up 85 per cent of the mass of the Universe.

(via astrodidact)

Gabriel’s Horn and the Painter’s ParadoxGabriel’s Horn is a three-dimensional horn shape with the counterintuitive property of having a finite volume but an infinite surface area.

This fact results in the Painter’s Paradox — A painter could fill the horn with a finite quantity of paint, “and yet that paint would not be sufficient to coat [the horn’s] inner surface” [1].

If the horn’s bell had, for example, a 6-inch radius, we’d only need about a half gallon of paint to fill the horn all the way up. Even though this half gallon is enough to entirely fill the horn, it’s not enough to even coat a fraction of the inner wall!

The mathematical explanation is a bit confusing if you haven’t taken a first course in calculus, but if you’re interested, you can check it out here.

Mathematica code:

x[u_, v_] := u y[u_, v_] := Cos[v]/u z[u_, v_] := Sin[v]/u Manipulate[ParametricPlot3D[{{x[u, v], y[u, v], z[u, v]}}, {u, 1, umax}, {v, 0, 2*Pi}, PlotRange -> {{0, 20}, {-1, 1}, {-1, 1}}, Mesh -> {Floor[umax], 20}, Axes -> False, Boxed -> False], {{umax, 20}, 1.1, 20}]Additional source not linked above.