Does the Sun shine in high-energy gamma rays? Apparently so, in the form of a halo surrounding itself. But certain features of this gamma-ray halo are perplexing.
The moon provides an easy way to detect rare ultra-high-energy cosmic rays.
Cosmic rays hit the Earth and produce showers of particles that can be detected on the ground. Understanding where these cosmic rays come from can help scientists pin down their sources and construct models for the magnetic field in our neighborhood.
Looking for something fun to consider today? Try this on for size: what happens to life on Earth if a gamma-ray burst points at us from within our own galaxy?
An array of cosmic ray telescopes in western Utah is determining the origin of the most energetic particles in the Universe.
In this article, the authors measure the cosmic ray ionization rate within a few parsecs of the galactic center. They find that the cosmic ray ionization rate is an order of magnitude larger than the galactic standard and also that the molecular gas near the galactic center is much warmer than the typical galactic molecular cloud.