•Radiation pressure (pressure of light)
–See present day effects in comets
–Most important effect
•Solar Wind
–Strong solar winds from young T Tauri
stars
–Will see present day effects in
comets
•Sweeping up of debris into planets
–Late Heavy Bombardment
•Ejection
of material by near misses with planets
–Like
“gravity assist maneuvers” with spacecraft
–Origin
of the comets