how does this medium interact with the interplanetary medium?
In the region beyond the termination shock, called the heliosheath, interstellar matter interacts with the solar wind. "Voyager 1" provided the first direct probe of conditions in the ISM .
Interstellar medium
 In the region beyond the termination shock, called the heliosheath, interstellar matter interacts with the solar wind. 
difference between solar nebula theory and nebular hypothesis The widely accepted modern variant of the nebular theory is the solar nebular disk model (SNDM) or solar nebular model. It offered explanations for a variety of properties of the Solar System what is this hypothesis? The Nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System. what does it say about rocky planets? According to the solar nebular disk model, rocky planets form in the inner part of the protoplanetary disk, within the frost line, where the temperature is high enough to prevent condensation of water ice and other substances into grains. does it say anything about protostars? Yes, Gas in the central part of the nebula, with relatively low angular momentum, undergoes fast compression and forms a hot hydrostatic core.  The core gradually grows in mass until it becomes a young hot protostar. when was this type of star discovered? The modern picture of protostars, summarized above, was first suggested by Chushiro Hayashi in 1966 is there anything particular about their evolution? Star formation begins in relatively small molecular clouds called dense cores.  As the dense core accrues mass from its larger, surrounding cloud, self-gravity begins to overwhelm pressure, and collapse begins. what are these clouds? A molecular cloud, sometimes called a stellar nursery (if star formation is occurring within), is a type of interstellar cloud, the density and size of which permit the formation of molecules, most commonly molecular hydrogen (H). where do they occur? Within the Milky Way, molecular gas clouds account for less than one percent of the volume of the interstellar medium (ISM), yet it is also the densest part of the medium. which matter is found in this medium? This matter includes gas in ionic, atomic, and molecular form, as well as dust and cosmic rays.
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Interstellar medium [SEP] Interaction with interplanetary medium
The interstellar medium begins where the interplanetary medium of the Solar System ends. The solar wind slows to subsonic velocities at the termination shock, 90–100 astronomical units from the Sun. In the region beyond the termination shock, called the heliosheath, interstellar matter interacts with the solar wind. "Voyager 1", the farthest human-made object from the Earth (after 1998), crossed the termination shock December 16, 2004 and later entered interstellar space when it crossed the heliopause on August 25, 2012, providing the first direct probe of conditions in the ISM .