ScienceDaily: Cosmic Rays News |
- NASA's Chandra X-ray Observatory celebrates 15th anniversary
- NASA's Fermi finds a 'transformer' pulsar
- Massive neutrinos and new standard cosmological model: No concordance yet
| NASA's Chandra X-ray Observatory celebrates 15th anniversary Posted: 22 Jul 2014 09:48 AM PDT Fifteen years ago, NASA's Chandra X-ray Observatory was launched into space aboard the Space Shuttle Columbia. Since its deployment on July 23, 1999, Chandra has helped revolutionize our understanding of the universe through its unrivaled X-ray vision. |
| NASA's Fermi finds a 'transformer' pulsar Posted: 22 Jul 2014 09:04 AM PDT In late June 2013, an exceptional binary containing a rapidly spinning neutron star underwent a dramatic change in behavior never before observed. The pulsar's radio beacon vanished, while at the same time the system brightened fivefold in gamma rays, the most powerful form of light, according to measurements by NASA's Fermi Gamma-ray Space Telescope. |
| Massive neutrinos and new standard cosmological model: No concordance yet Posted: 22 Jul 2014 06:13 AM PDT Neutrinos, also known as 'ghost particles' because they barely interact with other particles or their surroundings, are massless particles according to the standard model of particle physics. However, there is a lot of evidence that their mass is in fact non-zero, but it remains unmeasured. In cosmology, neutrinos are suspected to make up a fraction —- small but important -— of the mysterious dark matter, which represents 90% of the mass of the galaxy. Modifying the standard cosmological model in order to include fairly massive neutrinos does not explain all the physical observations simultaneously. |
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