Interstellar: referring to the space between the stars. The expanding solar wind from our Sun eventually runs into the solar winds of other stars at a boundary marking the end of the Sun's influence (and separating our solar system from interstellar ...
Here the solar wind meets the interstellar medium. Solar WindA stream of tiny particles of gas and plasma emitted by the Sun. The speed of the solar wind is about 400 kilometres (250 miles) per second in the vicinity of Earth's orbit.
Oort cloud: A Dutch astronomer, Jan Oort, observed in 1950 that no comet had ever been seen with an orbit indicating that it came from interstellar space, nor did comets seem to have a preferred direction of origin.
1985: Discoveries are made by high-level physicists that the earth is being showered by cosmic ray particles capable of traveling thousands of light-years through interstellar space without being scattered by interstellar magnetic fields.
In the last two years, Voyager 1, passed through the so-called termination shock reaching the solar system's final frontier, a vast expanse where wind from the Sun blows hot against thin gas between the stars: interstellar space.
 See also: Astrology, Planet, Solar, Solar system, Sun
  
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