The Oort cloud as a remnant of the protosolar nebula

If comets are assumed to have been created in the cool, dense regions of interstellar clouds, then these macroscopic bodies have to take part in the collapse of a protostar cloud as bodies following the laws of mechanics, in contrast to the gas and microscopic dust, which follow the laws of hydrodynamics. Here we present evidence concerning the solar system comets: if the velocity distribution of comets before the collapse of protosolar cloud was similar to what it is now in the outer Oort cloud then the comets would have remained at large distances from the centre of the cloud. Hence, the comets in the solar Oort cloud may represent a remnant of the nebular stage of the solar system.