Structure of a Comet To Sun Ion Tail Dust Tail Coma
Comet Structure Nucleus 10 km “Dirty Snowball” Coma Cloud of evaporated ices and ions may be 100,000 km in diameter Tail Always points away from Sun Solar Wind and Radiation Pressure
The Oort Cloud In 1950 Jan Oort noticed that no comet has been observed with an orbit that indicates that it came from interstellar space, there is a strong tendency for aphelia of long period comet orbits to lie at a distance of about 50,000 AU, and there is no preferential direction from which comets come.
Barringer’s Crater An iron meteorite 100 feet across and 70,000 tons slamed into the Earth at about 43,000mph in the Arizona desert near Flagstaff 40,000 years ago. Barringer Crater is 4,100 feet wide and 571 feet deep.