Evolution of pressure-free collapse with Hawking radiation. For easy of plotting, the luminosities are scaled by a factor of 1000. The thin dashed lines in the upper panel represent the respective quantities in a pure Oppenheimer-Snyder collapse of the same initial conditions. (Credit: Mersini-Houghton, Pfeier)
via uncnews
Einstein, like no other physicist before or after him, demonstrated how the power of human thought alone, used skillfully, can allow us to consider experiments that could never be practically performed. This line of thinking, these experiments performed only in our imaginations, showed we little humans often have the power to deduce equations that govern the natural world by logical deduction alone. (Credit:E. Siegel, Luis Royo Fantasy Art, via Photobucket user mikenolan78)
via medium
Astronomers find the strength of the electromagnetic force hasn’t changed in ten billion years. “We didn’t see any difference between electromagnetism in these three distant galaxies and here on Earth, so we don’t support that previous finding,” says Associate Professor Michael Murphy of Swinburne University. (S. Garry, Michael Murphy/Swinburne )
via abc
On Wednesday, Sept. 24, India could join the ranks of NASA, the European Space Agency and Russian Federal Space Agency having a successful mission to Mars. (Credit: AFP / Files / Manjunath Kiran)
via salon
Magnetic stripes of solar material – with alternating south and north polarity – march toward the sun’s equator. Such observations may change the way we think about what’s driving the sun’s 22-year solar cycle. (Credit: S. McIntosh)
This image illustrates Dawn’s spiral transfer from high altitude mapping orbit (HAMO) to low altitude mapping orbit (LAMO). The trajectory turns from blue to red as time progresses over two months. Red dashed sections are where ion thrusting is stopped so the spacecraft can point its main antenna toward Earth. (Credit: NASA/JPL-Caltech)
via nasa
The little mushroom cap between the two high-gain antennas is the X-band low-gain antenna. The little blue thing is DCAM3, a deployable camera that will hopefully take pictures of the explosion and impact of Hayabusa’s “Small Carry-on Impactor” while the mothership hides safely in the shadow of the asteroid. (Credit: Lakdawalla)
via gizmodo
Phase change materials can switch between two forms depending on how quickly they’re cooled. Cool them quickly and you get an amorphous form, which provides significant resistance to the flow of electrons. Cool them slowly and they will allow electrons to flow more readily. Once cooled, these two forms remain stable, locking the differences in conduction in place. (Credit: Columbia University, Timmer)
via arstechnica
The Yarkovsky Effect: The daylight side absorbs the solar radiation. As the object rotates, the dusk side cools down and hence emits more thermal photons than the dawn side. It may be possible to exploit this effect for planetary defense.
via thespacereview
An event in the IceCube neutrino telescope. Photomultipliers attached to strings buried deep in the Antarctic ice detect the bursts of light emitted when a neutrino collides with the ice and produces a muon. The event shown was generated by an upward moving muon, which was produced by an upward moving muon neutrino that passed through the Earth. APS/Joan Tycko;
via physics.aps
A 1974 photo of the part named Intersection 5 (I5) of the ISR of CERN’s old PS, clearly shows the layout of the magnets and the crossing of the two beams pipes. (Credit: Salem)
via onislam
Russian power engineering R&D institute NIKIET has completed the engineering design for the BREST-300 lead-cooled fast reactor. (NIKIET)
via world-nuclear-news
