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Latest Astroparticle physics Stories

9b3e0232e56d3bb37519d4ae5ef011a81
2009-06-25 13:15:00

Thanks to a unique "ballistic study" that combines data from ESO's Very Large Telescope and NASA's Chandra X-ray Observatory, astronomers have now solved a long-standing mystery of the Milky Way's particle accelerators. They show in a paper published today on Science Express that cosmic rays from our galaxy are very efficiently accelerated in the remnants of exploded stars. During the Apollo flights astronauts reported seeing odd flashes of light, visible even with their eyes closed. We have...

91b843622c4b1a80bee438fe043b95711
2009-06-23 11:02:43

The world's deepest underground science lab is being built below the Black Hills of South Dakota. With a depth equal to more than six Empire State buildings, the space is perfectly tailored to the needs of scientists in their quest for mysterious particles known as dark matter. Construction commenced Monday 4,850 feet below the Earth's surface under an abandoned gold mine that once hosted Nobel Prize-winning research. Scientists, politicians and other officials stood by watching. The...

2009-06-03 13:00:22

U.S. scientists are using high-energy particles from space in an attempt to solve one of nature's mysteries -- how thunderstorms create lightning. Florida Institute of Technology researchers Joseph Dwyer and Hamid Rassoul, with Martin Uman from the University of Florida, have developed a technique to remotely measure thunderstorm electrical fields on the ground. They said by measuring small radio pulses made by cosmic-rays passing through the storms, they might be able to reconstruct the...

add0cdb96489c74a7d5d290808aa82e7
2009-05-04 11:05:00

Since its launch last June, NASA's Fermi Gamma-ray Space Telescope has discovered a new class of pulsars, probed gamma-ray bursts and watched flaring jets in galaxies billions of light-years away. Today at the American Physical Society meeting in Denver, Colo., Fermi scientists revealed new details about high-energy particles implicated in a nearby cosmic mystery. "Fermi's Large Area Telescope is a state-of-the-art gamma-ray detector, but it's also a terrific tool for investigating the...

2009-02-05 08:26:00

HAMPTON, Va., Feb. 5 /PRNewswire-USNewswire/ -- Most of the universe remains mysterious to scientists and researchers everywhere. More than 90 percent of the universe is "dark," composed of dark energy and dark matter observed only by their gravitational interaction with both light and "normal" matter. (Logo: http://www.newscom.com/cgi-bin/prnh/20081007/38461LOGO) Understanding the nature of dark energy and matter is one of the most significant challenges in science -- one that researcher...

2009-01-27 09:06:44

British scientists say they've detected cosmic rays reaching an underground detector that reflect major weather events occurring in the Earth's stratosphere. The researchers said the cosmic-rays detected half a mile underground in a unused U.S. iron mine can be used to determine major weather events occurring 20 miles above the Earth. The researchers from the United Kingdom's National Center for Atmospheric Science and the Science and Technology Facilities Council said the study shows how the...

3ec4ae10354dc6a603f6a2454ee87c3e1
2008-12-11 16:49:34

Calibration tool will reveal when hypothetical particles are detected Several research projects are underway to try to detect particles that may make up the mysterious "dark matter" believed to dominate the universe's mass. But the existing detectors have a problem: They also pick up particles of ordinary matter -- hurtling neutrons that masquerade as the elusive dark-matter particles the instruments are designed to find. MIT physicist Jocelyn Monroe has a solution. A new detector she and her...

86d0ede1dcf93545f31c148df7e9aaf81
2008-11-24 09:25:34

Milagro Observatory unveils something never before seen from Earth A Los Alamos National Laboratory cosmic-ray observatory has seen for the first time two distinct hot spots that appear to be bombarding Earth with an excess of cosmic rays. The research calls into question nearly a century of understanding about galactic magnetic fields near our solar system. Joining an international team of collaborators, Los Alamos researchers Brenda Dingus, Gus Sinnis, Gary Walker, Petra Hntemeyer and John...

cba632275d2aaedd0baa907942caf2f31
2008-11-19 13:45:00

An international team of researchers has discovered a puzzling surplus of high-energy electrons bombarding Earth from space. The source of these cosmic rays is unknown, but it must be close to the solar system and it could be made of dark matter. Their results are being reported in the Nov. 20th issue of the journal Nature. "This is a big discovery," says co-author John Wefel of Louisiana State University. "It's the first time we've seen a discrete source of accelerated cosmic rays standing...

75457fa967ddb3f30025f7691345080b1
2008-10-17 10:50:00

A team of researchers in Canada have made a bold stride in the struggle to detect dark matter. The PICASSO collaboration has documented the discovery of a significant difference between the acoustic signals induced by neutrons and alpha particles in a detector based on superheated liquids. Since neutron induced signals are very similar to dark matter induced signals, this new discovery, published today, Thursday, 16 October, in the New Journal of Physics, could lead to improved background...


Latest Astroparticle physics Reference Libraries

7_58175f5465a1e9a63adec3509c888ff12
2004-10-19 04:45:44

WIMP -- In astronomy, WIMPs, or weakly interacting massive particles, figure into one explanation of the dark matter problem. The particles are called "weakly interacting" because they seem not to have much interaction with normal matter (electrons, protons, and neutrons) other than gravitational attraction (thus "massive"). Assuming that there are Weakly Interacting Massive Particles, these particles would then fall out of equilibrium with the universe when they are non-relativistic....

6_da99fb8ccd6eba27f4bcf7590775bd272
2004-10-19 04:45:41

Massive Compact Halo Object (MACHO) -- Massive compact halo objects, or MACHOs, are a type of astronomical body proposed as one possible explanation for the presence of dark matter in galactic halos. A MACHO is a small chunk of normal baryonic matter, far smaller than a star, which drifts through interstellar space unassociated with any solar system. Since MACHOs would not emit any light of their own, they would be very hard to detect. Recent work has suggested that MACHOs are not...

6_c75a47629377d810d1848fd2d1c26e952
2004-10-19 04:45:41

Cosmic Rays -- Cosmic Rays. Cosmic rays are energetic particles that are found in space and filter through our atmosphere. Cosmic rays have interested scientists for many different reasons. They come from all directions in space, and the origination of many of these cosmic rays is unknown. Cosmic rays were originally discovered because of the ionozation they produce in our atmosphere. Cosmic rays also have an extreme energy range of incident particles, which have allowed physicists to...

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Word of the Day
mallemaroking
  • Nautical, the visiting and carousing of sailors in the Greenland ships.
This word is apparently from a confusion of two similar Dutch words: 'mallemerok,' a foolish woman, and 'mallemok,' a name for some persons among the crew of a whaling vessel.