08/18/2014 - 07:01

A new search for dark matter will soon be underway after a second generation experiment was selected by US funding agencies. Most physicists believe that dark matter particles make up most of the mass of the universe, but these particles have never been observed directly since they neither emit nor absorb light at any wavelength.

07/08/2014 - 14:09

Planet Mercury's unusual metal-rich composition has been a longstanding puzzle in planetary science. According to a study published online in Nature Geoscience July 6, Mercury and other unusually metal-rich objects in the solar system may be relics left behind by collisions in the early solar system that built the other planets.


06/17/2014 - 20:24

It is likely that most of the large impact craters on Earth have already been discovered and that others have been erased, according to a new calculation by a pair of Purdue University graduate students.

05/01/2014 - 09:08

Out on the edge of the universe, 75,000 light years from us, a galaxy known as Segue 1 has some unusual properties: It is the faintest galaxy ever detected. It is very small, containing only about 1,000 stars. And it has a rare chemical composition, with vanishingly small amounts of metallic elements present.


04/25/2014 - 10:48

A study on rats exposed to proton irradiation, simulating that experienced by astronauts on two-year planetary missions, indicates that some astronauts may be at risk of cognitive impairment. A substantial sub-group of the radiation-exposed rats displayed decreased accuracy, increased premature responding, increased attention lapses and slower reaction times in a rodent version of the human psychomotor vigilance test (PVT). This appears to be due to changes in the dopamine transporter system. The study, from researchers in Johns Hopkins University School of Medicine is published in the current issue of the journal Radiation Research.


04/23/2014 - 17:23

Studies have shown that impulsive Solar Energetic Particle (SEP) events emit Fe ions with QFe < 14 at the lowest energies (E ≤ 0.1 MeV/nuc) that are consistent with typical corona source material (DiFabio et al., ApJ, 687, 623, 2008). However, the occasional observation of Fe with QFe > 16 in solar wind associated with active regions (Lepri et al., JGR, 106, 29231, 2001) led to a search for acceleration of high charge state Fe in all SEP events observed with ACE SEPICA.