The icy rocky tiny planet- like objects aka planetesimals , that originate from within the Oort cloud and later exit and start flying to the inner parts of our solar system are usually

Respuesta :

Answer: are usually called Long- period comets.

Explanation: Long Period comets  have periods ranging from 200 years to thousands of years. They are icy rocky planetesimals which originate from th Oort cloud located  beyond Pluto and the extreme  edges of the Kuiper Belt and fly towards the inner parts of our solar systems.C/2012 S1 (ISON) and C/2013 A1 Siding Spring are two most recent Long period comets originating from the Oort cloud as reported by NASA.