We may think of black holes as swallowing entire stars— or any other object that wanders too close to their immense gravity. But sometimes, a star that is almost captured by a black hole escapes with only a portion of its mass torn off. Astronomers have gotten the closest look yet at what happens when a black hole takes a bite out of a star— and the star lives to tell the tale.
“Here’s some of the stories trending This Week at NASA!” Images from comet’s Mars flyby
Ever wonder why your favorite sweets taste, well, sweet? Whether they’re made with sugar or artificial sweeteners, it all comes down to chemistry, and a very special shape known as the "sweetness triangle."
An optical engineer led the development of the Rapid Adaptive Zoom for Assault Rifles (RAZAR) prototype. At the push of a button, RAZAR can toggle between high and low magnifications, enabling soldiers to zoom in without having to remove their eyes from their targets or their hands from their rifles.
If growing vegetables in a box with no soil and out of direct sunlight sounds a little fishy, well, it is. Aquaponics is a relatively new way of intensified farming that combines aquaculture and hydroponics, according to a vegetable specialist.
Researchers have created a cellular probe that combines a tarantula toxin with a fluorescent compound to help scientists observe electrical activity in neurons and other cells. The probe binds to a voltage-activated potassium ion channel subtype, lighting up when the channel is turned off and dimming when it is activated.
Engineers have built and tested an earthquake-resistant house that stayed staunchly upright even as it shook at three times the intensity of the destructive 1989 Loma Prieta temblor 25 years ago.
“Here’s some of the stories trending This Week at NASA!” Power spacewalk
Scientists have found evidence for a huge mountain range that sustained an explosion of life on Earth 600 million years ago. The mountain range was similar in scale to the Himalayas and spanned at least 2,500 kilometers of modern west Africa and northeast Brazil, which at that time were part of the supercontinent Gondwana.
West African chimpanzees will search far and wide to find Alchornea hirtella, a spindly shrub whose straight shoots provide the ideal tools to hunt aggressive army ants in an ingenious fashion. The plant provides the animals with two different types of tool, a thicker shoot for digging and a more slender tool for dipping.
A researcher has been studying prosthetics for a decade and is part of a group working to develop a sensor to tell how a limb changes, along with a system that automatically accommodates those changes. After additional testing and refinements, he hopes to find a company that wants to market the sensor system.
A plot has been discovered, apparently spread across Russia, India and China, whereby cash machines can be turned into a free money vending machine. The hack requires re-starting the cash machine– essentially a Windows terminal– from a prepared CD that injects malware into the system to circumvent the security.
Highlighting unexpected similarities between what animals do and what people are trying to do is a new strategy researchers are using to hopefully increase public awareness about animals and encourage conservation. They’ve created an iPhone app based on biologically inspired design, highlighting two dozen species that have helped engineers solve problems or invent new solutions.
“Here’s some of the stories trending This Week at NASA!” U.S. spacewalk on ISS
A long-sought goal of creating particles that can emit a colorful fluorescent glow in a biological environment, and that could be precisely manipulated into position within living cells, has been achieved by a team of researchers.