Friday, May 31, 2013
With a little help from Photoshop, their daughter looks capable beyond her years.
Though Curiosity the rover can explore and see Mars up close, curious men and women of Earth will have to wait a bit longer. NASA reports that a manned trip to Mars is likely impossible with current technology because of radiation. Curiosity's Radiation Assessment Detector (RAD) was able to measure the radiation of Mars from inside the spacecraft and found data that makes NASA reconsider the effectiveness of current radiation shielding. Specifically: The findings, which are published in the May 31 edition of the journal Science, indicate radiation exposure for human explorers could exceed NASA's career limit for astronauts if current propulsion systems are used. Two forms of radiation pose potential health risks to astronauts in deep space. One is galactic cosmic rays (GCRs), particles caused by supernova explosions and other high-energy events outside the solar system. The other is solar energetic particles (SEPs) associated with solar flares and coronal mass ejections from the sun. Right now, spacecrafts do a better job at shielding against SEPs than they do GCRs. GCRs are highly energetic and penetrate the shielding on current spacecrafts. In order to protect astronauts from being exposed to radiation, NASA might have to invent better shielding.Or invent better something.
Projecting interactive outlines of devices has been done before, but it is a lot trickier doing it on a moving object. Ishikawa's system detects and maps the position of an object 500 times per second and projects an image onto it. more
Measuring the position of a single electron "collapses" the wave function, forcing it to pick a particular position, but that alone is not representative of its normal, quantum presence in the atom. "Wave functions are difficult to measure. They're exquisite quantum objects that change their appearance upon observation," says Aneta Stodolna of the FOM Institute AMOLF in Amsterdam, the Netherlands. Her team decided to make a picture using a technique dreamed up 30 years ago that can be thought of as a quantum microscope. Rather than taking an image of a single atom, they sampled a bunch of atoms. This removes the quantum nature of each individual atom's electron, forcing it to choose a particular location from those it is allowed to reside in. Do it with enough atoms and the number choosing each spot will reflect the quantum probabilities laid out by the wave function. Stodolna's team made a beam of atomic hydrogen and zapped it with two separate lasers that excited the atoms' electrons by precise amounts. An applied electric field then pushed the excited electrons away from their respective nuclei, towards a detector about half a metre away. The electrons emitted waves that produced an interference pattern on the detector (see "An atom undressed"). Crucially, the pattern was a projection of the spacings of the energy levels in the hydrogen atom, as laid out in the wave function, with bright rings where electrons were present and dark lanes where they were not (Physical Review Letters, doi.org/mmz). "You can think about our experiment as a tool that allows you to look inside the atom and see what's going on,"Stodolna says.
Thursday, May 30, 2013
Wednesday, May 29, 2013
The photos were captured by a camera on NASA's Curiosity Rover.
Tuesday, May 28, 2013
Barry Rosenthal, who spends much of his time on beaches in gloves and knee-high boots, combing through glass, plastic, and other junk, finds artistic inspiration in what others leave behind.
waving bloody knives and cleavers at the cameras.
The baby is now safe and stable in hospital while the police are treating it as attempted murder.
Monday, May 27, 2013
"The Irish wolfhound is the tallest dog breed and one of the biggest of the giant breeds so, based on the calculations that were provided to work out a dog's human age equivalent, Xavier would have been somewhere in his 120s. To have reached the age that he did was a particular achievement because the breed average for a wolfhound is seven years. "In terms of the secret to such longevity, I think much can be attributed to Xavier being content to laze around for large quantities of time. He wasn't particularly active. The scene in the [above] photo portrayed a fairly typical day for him. Also, naturally, he was part of a loving family and was involved in everything we did. We were very fortunate to have had him with us for so long."
The FINIS Neptune works on this issue by sending sound waves straight into your face.