Muhiti baynisitoravi

Muhiti baynisitoravi, gaz, changu gubor, nurhoi kayhonie, ki muhiti sistemahoi sitoravi –galaktikahoro pur kardaand. Muhiti baynisitoravi az muhiti baynisayyoravi va muhiti baynigalaktiki farq mekunad. Moddai asosii Muhiti baynisitoravi gazest, ki on az gidrogen va geliy (bo gashhoi oksigen, nitrogen, gazi karbon)  va gayra iborat ast.

Dar Galaktikai mo diametri abrhoi baynisitoravi odatan 5-40 pk kontsentratsiyai atomho dar 1 sm kubi az 2 to 100, harorat az 20 to 100 Kontsentratsiyaro tashkil medikhad. Bayni abrho zichii gazho khurdtar (100 atom/dm kubi), harorat boshad 7000 K meboshad: atomhoi gidrogen asosan neytral buda, darozii mavji afkanishotashon 21 sm ast. Dar qaribii sitorahoi tafson gidrogeni ionizonidashuda hast, ki haroratash 7000 K va az on  ziyodtar meshavad. Spektri onho az khathoi durakhshoni gidrogen va baze ionhoi digar iborat meboshand.  Gayr az gazho Muhiti baynisitoravi zarrahoi chang – moddahoi sakhti andozaashon az 0,1 to 1 mkm dorad. Chang beshtar nurhoi kabudro furu mebarad. Az in sabab nuri kabudi sitorahoi dur sust buda, onho surkhchatob menamoyand. Abrhoi zichi gazu gubor, ki ravshanii Rohi Kahkashonro furu mebarand, tira metoband. Fazoi bayni galaktikahoro muhite pur mekunad, ki zichiash  nazar ba zichii Muhiti baynisitoravi 4-5 marotiba kam ast.