According to our best theories of physics, the universe is a fixed block where time only appears to pass. Yet if the flow of time is an illusion, how do we account for the distinction between past, present and future? In June, 60 physicists gathered for four days at the Perimeter Institute for Theoretical Physics to debate this another questions about the mysteries of time.
https://www.youtube.com/watch?v=Wcg6gCbFBWY&feature=youtu.be
Exploring our Holographic Galaxy with my Hololens DevKit.
Shared from my #HoloLens #YawLife.
Physics, as you may have read before, is based around two wildly successful theories. On the grand scale, galaxies, planets, and all the other big stuff dance to the tune of gravity. But, like your teenage daughter, all the little stuff stares in bewildered embarrassment at gravity’s dancing. Quantum mechanics is the only beat the little stuff is willing get down to. Unlike teenage rebellion, though, no one claims to understand what keeps relativity and quantum mechanics from getting along.
Because we refuse to believe that these two theories are separate, physicists are constantly trying to find a way to fit them together. Part-in-parcel with creating a unifying model is finding evidence of a connection between the gravity and quantum mechanics. For example, showing that the gravitational force experienced by a particle depended on the particle’s internal quantum state would be a great sign of a deeper connection between the two theories. The latest attempt to show this uses a new way to look for coupling between gravity and the quantum property called spin.
I’m free, free fallin’
Continue reading “Gravity doesn’t care about quantum spin” »
“When programmers at the MIT Instrumentation Laboratory set out to develop the flight software for the Apollo 11 space program in the mid-1960s, the necessary technology did not exist. They had to invent it.”
“As the long-running Cassini mission enters its last year at Saturn, NASA is moving forward with an early-stage technology study to send a drone to its moon Titan.”
Is search of the sound of silence.
To a physicist, perfect quiet is the ultimate noise. Silence your cellphone, still your thoughts, and muffle every kind of vibration, and you would still be left with quantum noise. It represents an indeterminacy deep within nature, bursts of static and inexplicable motions that cannot be gotten rid of, or made sense of. It seems devoid of meaning.
Considering how pervasive this noise is, you might presume that physicists would have a good explanation for it. But it remains one of the great unsolved problems in science. Quantum theory is silent not just on where the noise comes from, but on how exactly it enters the world. The theory’s defining equation, the Schrödinger equation, is completely deterministic. There is no noise in it at all. To explain why we observe quantum particles to be noisy, we need some additional principle.
Continue reading “The Noise at the Bottom of the Universe” »
Military bosses claim the engine for the craft has already been tested, and a prototype could take to the air in six years.
It would be able to travel anywhere in the world in two hours and drop a devastating nuclear warhead before returning to base, it is claimed.
Continue reading “Russian hypersonic bomber can launch nuclear attacks from space” »
Enhancing astronomers’ ability to peer ever more deeply into the cosmos may hinge on developing larger space-based telescopes. A new concept in space telescope design makes use of a modular structure and an assembly robot to build an extremely large telescope in space, performing tasks in which astronaut fatigue would be a problem.
The robotically assembled modular space telescope (RAMST) design is described by Nicolas Lee and his colleagues at the California Institute of Technology and the Jet Propulsion Laboratory in an article published this week by SPIE, the international society for optics and photonics, in the Journal of Astronomical Telescopes, Instruments, and Systems (JATIS).
Ground-based telescopes are limited by atmospheric effects and by their fixed location on the Earth.
