"Matter is not distributed uniformly in the Universe," says Masayuki Tanaka from ESO, who led the new study. "In our cosmic vicinity, stars form in galaxies and galaxies usually form groups and clusters of galaxies. The most widely accepted cosmological theories predict that matter also clumps on a larger scale in the so-called 'cosmic web', in which galaxies, embedded in filaments stretching between voids, create a gigantic wispy structure."
Heavens
Nearby galaxies undergoing a furious pace of star formation also emit lots of gamma rays, say astronomers using NASA's Fermi Gamma-ray Space Telescope. Two so-called "starburst" galaxies, plus a satellite of our own Milky Way galaxy, represent a new category of gamma-ray-emitting objects detected both by Fermi and ground-based observatories.
When NASA's Aqua satellite flew over the Philippine Sea during the early morning hours today, November 2 infrared imagery saw another new tropical cyclone coming together.
The U.S. Navy's Joint Typhoon Warning Center, the organization that forecasts tropical cyclones in that area of the world is getting a workout. Tropical Storm Mirinae just made landfall this morning in Vietnam, and had crossed northern Luzon, the Philippines this past weekend. Now, there's another threat in the region.
Mirinae (Santi) caused 12 hours of flooding rains in the Philippines when it crossed the northern Luzon region over the weekend. On October 31 at 5 a.m. Local (Asia/Manila) Time (October 30 at 2100 UTC) Typhoon Mirinae weakened dramatically after it moved inland over central Luzon, the Philippines. By October 31 at 5 p.m. Local time, Mirinae had already reemerged into the South China Sea as a tropical storm and was headed for Vietnam, but it left behind floods, destruction and death. Mirinae made landfall in Vietnam early this morning, Eastern Time.
Nearly 100 years ago, scientists detected the first signs of cosmic rays - subatomic particles (mostly protons) that zip through space at nearly the speed of light. The most energetic cosmic rays hit with the punch of a 98-mph fastball, even though they are smaller than an atom. Astronomers questioned what natural force could accelerate particles to such a speed. New evidence from the VERITAS telescope array shows that cosmic rays likely are powered by exploding stars and stellar "winds."
AMES, Iowa - Iowa State University astrophysicists contributed to the recent discovery that a galaxy quickly creating new stars is also a source of high energy gamma rays.
An international collaboration that includes scientists from the University of Delaware's Bartol Research Institute in the Department of Physics and Astronomy has discovered very-high-energy gamma rays in the Cigar Galaxy (M82), a bright galaxy filled with exploding stars 12 million light years from Earth.
The gamma rays observed by the team have energies more than a trillion times higher than the energy of visible light and are the highest-energy photons ever detected from a galaxy undergoing large amounts of star formation.
Magnetized plasmas occupy a large fraction of our cosmic universe; they exist on our sun, in the earth's magnetosphere, and in astrophysical plasmas. They also exist in laboratory magnetic fusion grade plasmas, and in other smaller experiments as well. Energy stored in stressed magnetic fields can produce large-scale explosive events that spontaneously evolve and energize particles, owing to unsteady and impulsive local processes in small volumes of space. The abrupt onset and cessation of these events in astrophysical and laboratory plasmas is a long-standing puzzle.
HOUSTON -- (Nov. 2, 2009) – Specially developed immune system cells that target the common Epstein-Barr virus can protect immune-suppressed bone marrow transplant recipients against lymph system disease and cancers that arise from the viral infection, said a group of researchers led by those from Baylor College of Medicine, The Methodist Hospital and Texas Children's Hospital.
A detailed picture of the seeds of structures in the universe has been unveiled by an international team co-led by Sarah Church of the Kavli Institute for Particle Astrophysics and Cosmology, jointly located at the Department of Energy's SLAC National Accelerator Laboratory and Stanford University, and by Walter Gear, of Cardiff University in the United Kingdom.
Washington, D.C.—Dust samples collected by high-flying aircraft in the upper atmosphere have yielded an unexpectedly rich trove of relicts from the ancient cosmos, report scientists from the Carnegie Institution. The stratospheric dust includes minute grains that likely formed inside stars that lived and died long before the birth of our sun, as well as material from molecular clouds in interstellar space.
Converting sunlight to electricity might no longer mean large panels of photovoltaic cells atop flat surfaces like roofs.
Using zinc oxide nanostructures grown on optical fibers and coated with dye-sensitized solar cell materials, researchers at the Georgia Institute of Technology have developed a new type of three-dimensional photovoltaic system. The approach could allow PV systems to be hidden from view and located away from traditional locations such as rooftops.
A physics experiment using a super-fast explosion in a galaxy 7.3 billion light-years away has given scientists rare experimental evidence about the fundamental structure of space and time. The experiment was performed by a team that includes astrophysicists at Penn State University, who used NASA's Fermi Gamma Ray Space Telescope to study particles from the explosion moving at nearly the speed of light. The experiment confirmed aspects of Einstein's theories of gravity, which unite space and time in the concept of space-time.
A detailed picture of the seeds of structures in the universe has been unveiled by an international team co-led by a Cardiff University scientist.
The team has obtained extremely precise data about the early universe, using a telescope near the South Pole in the Antarctic.
WINSTON-SALEM, N.C. – A new study by researchers at Wake Forest University School of Medicine suggests that many patients are dissatisfied with the way they receive results of radiology tests and want more access to information in their medical records, specifically, detailed, lay-language results from those tests.