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How vacuous is intergalactic space?

The emptiness of space is explained in many articles... But, space does contain some matter due to these possible reasons:

  • During the explosion of supernovae, some elements are created. Not all supernovae nucleosynthesis are successful. So, there should be some scattering of matter into outer space.

  • Cosmic rays are coming from interstellar space (and even from sun) in all directions. Would all of the particles have enough efficiency to reach their destination (I mean, take earth or any other interstellar object)?. Some protons or neutrons could be scattered into space.

  • Even the gaseous molecules in atmosphere of celestial bodies have possibility to reach escape velocity and go into space.

Are my assumptions correct? If so, then space must contain elements up to some extent. Isn't it? Or is it due to the infiniteness of space, that these scattered particles are ignored?

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marked as duplicate by David Z Sep 17 '12 at 17:52

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Still mixing too many idea in each question. "there should be some wastage of matter." No, it's not wasted, it just remains as lighter bit. "Would all of the particles have enough efficiency to reach their destination" The don't have 'destinations', they just have momenta. Some will get 'somewhere' (by which you presumably mean somewhere interesting) others will never get to anywhere in particular, but those places will still be somewhere in a strict sense of the word. – dmckee Sep 5 '12 at 14:46
up vote 3 down vote accepted

Space does indeed contain some matter. It is probably safe to assume, however, that moving further from stellar objects the density of this matter approaches 0. Regardless, this density is low enough to often be ignored.

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There is some matter just about everywhere.

Space may be infinite, but if it is then we think that the amount of matter is also infinite.

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