Cosmic ray

Increase of ionization with altitude as measured by Hess in 1912 (left) and by Kolhörster (right)

Hess lands after his balloon flight in 1912.

Cosmic rays are immensely high-energy radiation, mainly originating outside the Solar System. They may produce showers of secondary particles that penetrate and impact the Earth's atmosphere and sometimes even reach the surface. Composed primarily of high-energy protons and atomic nuclei, they are of mysterious origin. Data from the Fermi space telescope (2013) have been interpreted as evidence that a significant fraction of primary cosmic rays originate from the supernovae of massive stars. However, this is not thought to be their only source. Active galactic nuclei probably also produce cosmic rays.

单词	Origin of cosmic rays
释义	Origin of cosmic rays 英语百科 Cosmic ray Cosmic rays are immensely high-energy radiation, mainly originating outside the Solar System. They may produce showers of secondary particles that penetrate and impact the Earth's atmosphere and sometimes even reach the surface. Composed primarily of high-energy protons and atomic nuclei, they are of mysterious origin. Data from the Fermi space telescope (2013) have been interpreted as evidence that a significant fraction of primary cosmic rays originate from the supernovae of massive stars. However, this is not thought to be their only source. Active galactic nuclei probably also produce cosmic rays.
随便看	automatic loading equipment的意思 automatic loading mechanism的意思 automatic loading panel saw的意思 automatic load limitation的意思 automatic load maintainer的意思 automatic load regulation equipment的意思 automatic load regulator的意思 automatic load restoration equipment的意思 automatic load sharing的意思 automatic load sustaining brake的意思 automatic loan syndication的意思 automatic local exchange的意思 automatic local frequency control的意思 automatic location的意思 automatic lock的意思 automatic locking的意思 automatic locking device的意思 automatic lockout的意思 automatic locksewing machine的意思 automatic locomotive operation的意思 automatic logging的意思 automatic logging device的意思 automatic logic design的意思 automatic logic nesting的意思 automatic logic testing and recording equipment的意思

Origin of cosmic rays

Cosmic ray