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 Automatic translation  Automatic translation Category: Sun
Updated June 01, 2013
  Heliosphere - borders of the solar system

Image: The heliosphere protects the solar system of energy cosmic rays, beyond that boundary prevailing conditions of interstellar space extremely tenuous compared to Earth's atmosphere. The heliopause marks the boundary where the winds of particles emitted by the sun meet the other particles of the interstellar medium. The diffuse interstellar medium consists of material that fills the space between stars. Interstellar matter is mainly composed of ionized hydrogen (H+), atomic (H1) and molecular (H2), helium, grains whose size is of the order of several tens to several hundreds of nanometers and much dust bigger, from a few microns.


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