A new study using observations from NASA's Fermi Gamma-ray Space Telescope reveals the first clear-cut evidence that the expanding debris of exploded stars produces some of the fastest-moving matter in the universe. This discovery is a major step toward meeting one of Fermi's primary mission goals.
Cosmic rays are subatomic particles that move through space at nearly the speed of light. About 90 percent of them are protons, with the remainder consisting of electrons and atomic nuclei. In their journey across the galaxy, the electrically charged particles become deflected by magnetic fields. This scrambles their paths and makes it impossible to trace their origins directly.
Through a variety of mechanisms, these speedy particles can lead to the emission of gamma rays, the most powerful form of light and a signal that travels to us directly from its sources.
Two supernova remnants, known as IC 443 and W44, are expanding into cold, dense clouds of interstellar gas. This material emits gamma rays when struck by high-speed particles escaping the remnants.
Scientists have been unable to ascertain which particle is responsible for this emission because cosmic-ray protons and electrons give rise to gamma rays with similar energies. Now, after analyzing four years of data, Fermi scientists see a gamma-ray feature from both remnants that, like a fingerprint, proves the culprits are protons.
When cosmic-ray protons smash into normal protons, they produce a short-lived particle called a neutral pion. The pion quickly decays into a pair of gamma rays. This emission falls within a specific band of energies associated with the rest mass of the neutral pion, and it declines steeply toward lower energies.
Detecting this low-end cutoff is clear proof that the gamma rays arise from decaying pions formed by protons accelerated within the supernova remnants.
The Australian Bureau of Meteorology (BOM) has released its 2015–16 tropical cyclone season outlook today, signaling the start of severe weather public awareness campaigns in northern Australia. This year's strong El Niño is very likely to dominate the
Unusually warm and dry weather has been persistent across the US West during October 2015. A number of temperature records have already been broken, and hot conditions are expected to continue throughout the week, increasing the risk of wildfires in already devastated a
For many people, Einstein’s General Theory of Relativity lies hidden behind an impenetrable wall of complicated mathematics, superposed upon the widespread misconception that only those smarter than the average bear, with a penchant for doing long sums, can possib
A team of researchers from the University of South Florida St. Petersburg, Ventura College and UCLA Extension have provided the first ancient human genome sequence from Africa. The discovery holds the potential to provide new information about how ancient African people
Bellandur Lake, the largest lake in the city of Bangalore, India, is extremely polluted by a high amount of ammonia and phosphate while a very low amount of dissolved oxygen and refuse waters from across the city make the situation even worse. To an observer, the 36 km
A research team led by Dr. Steven Palmer from the University of Exeter has studied the water flow paths from a subglacial lake under the Greenland ice, and discovered that water was drained from the lake through a subglacial tunnel. The study also revealed that a simila
The Government of Haiti has officially issued an alert on the critical food insecurity situation in the country caused by the prolonged drought exacerbated by the influence of El Nino weather phenomena.The poorest of Haiti population are kept in food crisis due to droug
The first color images of Pluto's atmospheric hazes, provided last week by NASA's New Horizons spacecraft show the hazes scatter blue light, NASA announced on October 8, 2015. New Horizons has also detected small, exposed regions of water ice on Pluto, using the
Post-tropical Cyclone "Oho" threatens Alaska and British Columbia with hurricane wind gusts and heavy rainfall
Ex-hurricane "Oho", now a fully extra-tropical cyclone, has left the waters of Hawai'i and is now moving toward the Gulf of Alaska. It is expected to interact with a powerful jet stream on its journey across North Pacific Ocean, and turn into a powerful lo
New activity/unrest was observed at 6 volcanoes from September 30 - October 6, 2015. During the same period, ongoing activity was reported for 17 volcanoes. New activity/unrest: Alaid, Kuril Islands (Russia) | Copahue, Central Chile-Argentina border | Grimsvotn, Icela
A team of scientists from the Providence College, Roger Williams University, the University of South Florida, Stanford University and the University of Oregon have studied sophisticated, multi-jet propulsion system of marine animals known as siphonophores. The research
Tropical Storm "Choi-wan" interacted with a mid-latitude trough and generated a strong extra-tropical low system on October 7, 2015. The system is currently packing extremely strong winds of typhoon strength that already began affecting parts of Hokkaido islan
Scientists from University of Portland and US Geological Survey have joined the forces with Earth Sciences Animated and Mount Tabor Middle School Portland to create an animated video explaining tectonic earthquakes of the Pacific Northwest.The video describes the types
In a special report issued October 7, 2015 INSIVUMEH reported that activity at Fuego volcano had been at high level during recent weeks. Strombolian activity increased on October 6 to pulsating lava fountains from two summit vents feeding two lava flows. Gas-and-ash
A new sinkhole formed on a farmland in the Karapınar district, Turkey a couple of days ago, media reported on October 7, 2015. This is the 13th sinkhole to form in the area in the last 2 years, and 10th that formed since this year's spring. The new sinkhole is 10 m
Heavy rainfalls hit the northern province of Zonguldak's Ereğli district, Turkey on October 7, 2015 and caused severe flooding across Kdz Ereğli. Media reports numerous houses have been inundated and vehicles swept away by the raging waters.The rainfall began in t
Astronomers have discovered unique and unusual features within the dusty disc of the AU Microscopii star on images from the NASA/ESA Hubble Space Telescope and ESO's Very Large Telescope. Curious features are moving with an unusually fast speed, and are unlike anyth
The number of deaths reported from a major landslide in Santa Catarina Pinula, Guatemala is still on the rise, media reported, as of October 6, 2015.Video credit: Euro NewsSevere rainstorms that battered the small town in Guatemala, about 17 km (10 miles) east of Guatem
Our planet is under the influence of positive polarity coronal hole today which is causing enhanced geomagnetic conditions. Geomagnetic K-index of 6 (G2-Moderate geomagnetic storm) threshold was first reached at 05:17 UTC today. Geomagnetic K-index of 7 (G3 - Strong geo
A strong El Niño continues to persist in the tropical Pacific Ocean, Australian Bureau of Meteorology (BOM) reported on October 7, 2015. At the same time an emerging positive Indian Ocean Dipole (IOD) is contributing to strengthening the phenomenon, causing a sig
Joaquin, now a category 1 hurricane, has left behind the waters of Bermuda, and is now crossing over on the other side of the North Atlantic, rushing toward Ireland and UK. Although the system is still of a hurricane strength it is expected to weaken significantly over
Typhoon "Choi-wan", another tropical cyclone of the very active 2015 tropical season, continues to travel across the western Pacific, intensifying. This intensification will last only for the next 12 hours, and the storm strength is expected to ease significan
A new study lead by Martin Vollmer of the Swiss Federal Laboratories for Materials Science and Technology has found that after a rapid increase in anthropogenic compound named HCFC-133a (CF3CH2Cl), an ozone destroying gas, the atmospheric abundance and emissions have
A new research conducted by scientists from Michigan Technological University, the National Center for Atmospheric Research (NCAR) and Mainz University, has analyzed the mixing of particles of dry and water-saturated air within the clouds. The experiment was performed u
A research team from the John Innes Centre at the University of Wisconsin - Madison, in cooperation with an international team of scientists, has solved a mystery about how the plant life on Earth evolved from ancient alga. The research center announced the discovery pu
Children in mining and smelting towns who are exposed high levels of lead, arsenic and cadmium are more than twice as likely to have developmental disorders than the national average. They also perform lower than neighbouring peers on school tests, a research, published
Severe rainfalls triggered deadly floods across the South and North Carolina over the weekend of October 3, 2015. At least 9 people have died in flood related incidents in South Carolina, and hundreds of people were left stranded by the raging waters all over the states
Torrential rains swept the Cote d'Azur, southeast France on October 3, 2015, causing heavy flooding across the riviera. According to media reports, 16 people have been reported dead and at least 15 people went missing by the early afternoon of October 4. Strong rain
Typhoon "Mujigae", known as Kabayan in the Philippines, was rapidly intensifying before it hit southern China early Sunday, October 4, 2015. Mujigae was bringing powerful winds and heavy rain as it approached China, prompting officials to issue red alerts.
In the previous Space News episode, we discussed recent, astonishing images of the surface of the dwarf planet Pluto. Many other surprises have already been revealed in the data thus far released from NASA’s New Horizons mission.Today, physicist Eugene Bagashov di
No rest for the Hawaiian residents is in sight, as a new tropical storm formed in the central Pacific region on October 3, 2015. Tropical Storm "Oho" is currently over 500 km (310 miles) away from the Hawai'ian Islands, Central Pacific Hurricane Center (CP
A huge landslide, triggered by heavy downpours, collapsed onto Santa Catarina Pinula town, Guatemala on October 2, 2015. 30 people have been reported dead so far, and hundreds have gone missing. Rescue teams are actively sweeping the grounds in search of survivors.Heavy
A team of international scientists have found evidence that the sudden collapse of a volcano in the Cabo Verde Islands, off west Africa, generated a giant, 244 m (800 feet) tsunami that swallowed an island over 48 km (30 miles) away. The study was published in the Scien
Major Hurricane "Joaquin" has weakened slightly as its eye passed near San Salvador island, and is now a category 3 hurricane, National Hurricane Center (NHC) reported. Although newest modeling results suggest the system most likely won't make landfall
Heavy rainfall and winds affected the islands of Sardinia in Italy and Corsica, France as the intense low pressure system moved over the Mediterranean on October 1 and 2, 2015. Landslides and violent floods have been reported across the affected areas.An intense low pre