Pecos Hank has seen his share of storms, as evidenced by his cool footage of ominous green-hued clouds. He explains the science behind why massive thunderstorms can "go green," as they say in stormchaser parlance. Read the rest
As advanced atom smashers like the Large Hadron Collider come online, older ones are sometimes abandoned or, better, used for unexpected science experiments. Examples range from recording high-speed X-rays of the biological "motor" that flaps a fly's wings to finding an easter egg in a Degas painting. In the video above, Science Hack Day "global instigator" Ariel Waldman reveals how researchers hack particle accelerators for new uses.
Fidget spinners are wonderful. Read the rest
“It just seemed that cosmology was more exciting, because it really did seem to involve the big question: Where did the universe come from?” — Stephen Hawking, 8 January 1942 - 14 March 2018
British physicist Stephen Hawking has died at the age of 76. He was known for his groundbreaking work with black holes and relativity. Read the rest
So, what exactly is going to happen to that Tesla that Elon Musk shot into space?
It's going to wander around the solar system, sure. But there are planets and gravity and stuff, so what are the odds of it eventually slamming into something?
Small, but not zero -- according to this fun analysis by a group of astrophysicists! They modeled the Telsa's current trajectory and estimated that there's a mid-to-low-single-digit chance that it hits Earth or Venus over the next million years:
The orbital evolution is initially dominated by close encounters with the Earth. The first close encounter with the Earth will occur in 2091. The repeated encounters lead to a random walk that eventually causes close encounters with other terrestrial planets and the Sun. Long-term integrations become highly sensitive to the initial conditions after several such close encounters. By running a large ensemble of simulations with slightly perturbed initial conditions, we estimate the probability of a collision with Earth and Venus over the next one million years to be 6% and 2.5%, respectively. We estimate the dynamical lifetime of the Tesla to be a few tens of millions of years.Read the rest
See the tiny dot in the center of the photo above? That's a single strontium atom, visible to the naked eye. University of Oxford quantum physicist David Nadlinger's photo (full image below) won this year's Engineering and Physical Sciences Research Council's scientific photography competition.
“The idea of being able to see a single atom with the naked eye had struck me as a wonderfully direct and visceral bridge between the miniscule quantum world and our macroscopic reality," Nadlinger says. "A back-of-the-envelope calculation showed the numbers to be on my side, and when I set off to the lab with camera and tripods one quiet Sunday afternoon, I was rewarded with this particular picture of a small, pale blue dot.”
From the EPSRC:
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'Single Atom in an Ion Trap’, by David Nadlinger, from the University of Oxford, shows the atom held by the fields emanating from the metal electrodes surrounding it. The distance between the small needle tips is about two millimetres.
When illuminated by a laser of the right blue-violet colour the atom absorbs and re-emits light particles sufficiently quickly for an ordinary camera to capture it in a long exposure photograph. The winning picture was taken through a window of the ultra-high vacuum chamber that houses the ion trap.
Laser-cooled atomic ions provide a pristine platform for exploring and harnessing the unique properties of quantum physics. They can serve as extremely accurate clocks and sensors or, as explored by the UK Networked Quantum Information Technologies Hub, as building blocks for future quantum computers, which could tackle problems that stymie even today’s largest supercomputers.
Anil Dash's third law holds that "Three things never work: Voice chat, printers and projectors." But Joshua Rothman's long, fascinating, even poetic profile of the Xerox engineers who work on paper-path process improvements is such a bit of hard-science whimsy that it almost makes me forgive every hour I've spent swearing over jammed paper. Read the rest
The discovery built on the work of several teams of researchers:
Time crystals repeat in time because they are kicked periodically, sort of like tapping Jell-O repeatedly to get it to jiggle, Yao said. The big breakthrough, he argues, is less that these particular crystals repeat in time than that they are the first of a large class of new materials that are intrinsically out of equilibrium, unable to settle down to the motionless equilibrium of, for example, a diamond or ruby.
“This is a new phase of matter, period, but it is also really cool because it is one of the first examples of non-equilibrium matter,” Yao said. “For the last half-century, we have been exploring equilibrium matter, like metals and insulators. We are just now starting to explore a whole new landscape of non-equilibrium matter.”
Maybe the next step is the development of these time crystals:
• Scientists unveil new form of matter: time crystals (UC Berkeley via EurekAlert) Read the rest
Don Komarechka captures astonishing photographs of snowflakes. His book Sky Crystals is a survey of snowflake science, a monograph of his macrophotography masterpieces, and a tutorial on the techniques. At Petapixel, Komarechka explains the surprising pop of color sometimes seen through the lens when he's shooting a snowflake:
As a snowflake grows it often creates a cavity or bubble inside of it where the inner side of the crystal grows slower than the top and bottom edge. This forces the layers of ice on either side of the bubble to be incredibly thin, so much so that light will interfere with itself.
Some light will reflect off the surface of the snowflake, but some will also enter the ice (slowing down due to the density of ice compared to air) and reflect off the inner ice/air boundary back towards the camera. If the ice is thin enough, the distance between the two rays of light is close enough to force them to interfere with each-other now that they are out of sync. Some wavelengths get amplified and others get reduced, resulting in a distinctive color emerging based on the thickness of the ice.
"How I Capture Vibrant Colors Inside Snowflakes" (PetaPixel)
Laser Maze is a super-fun electronic board game that challenges players to arrange angled mirrors to route a laser beam from an emitter to a sensor, avoiding obstacles; in The Quantum Game, you undertake the same fundamental task, but with a virtual laser that only emits one photon, and virtual beam-splitters, absorbtive polarizers, quarter-wave plates, polarizing beam splitters, Faraday rotators, and other exotic apparatus. Read the rest
The Simulation Hypothesis holds that alien races (or future versions of humanity) will eventually get the computing power and programming techniques to simulate the whole universe and that when they do, they will probably do so millions of times, meaning that most universes are simulations, and thus the odds that this universe is not a simulation are vanishingly small. Read the rest
The always-excellent maker of animated explainer videos, Kurzgesagt – In a Nutshell just released a new video that explains what black holes are, explains what information is, and then goes into the way that black holes are the cause of something called "The Information Paradox." The takeaway: we all might be stretched on a flat screen, just imagining that we are in three dimensions. Read the rest