Astronomy Picture of the Day
    


Cosmic Rays
<< Yesterday 14.08.2006 Tomorrow >>
Cosmic Rays
Credit & Copyright: NASA
Explanation: Have you ever been hit by a beam of high energy particles from above? Surely you have -- it happens all of the time. Showers of high energy particles occur when energetic cosmic rays strike the top of the Earth's atmosphere. Cosmic rays were discovered unexpectedly in 1912. It is now known that most cosmic rays are atomic nuclei. Most are hydrogen nuclei, some are helium nuclei, and the rest heavier elements. The relative abundance changes with cosmic ray energy -- the highest energy cosmic rays tend to be heavier nuclei. Although many of the low energy cosmic rays come from our Sun, the origins of the highest energy cosmic rays remains unknown and a topic of much research. This drawing illustrates air showers from very high energy cosmic rays. Cosmic rays may even be important to Earth's weather -- common lighting may be triggered by passing cosmic rays.

January
February
March
April
May
June
July
August
September
October
November
December
 < August 2006  >
Mo Tu We Th Fr Sa Su

123456
78910111213
14151617181920
21222324252627
28293031


Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Based on Astronomy Picture Of the Day

Publications with keywords: cosmic rays
Publications with words: cosmic rays
See also:
All publications on this topic >>