Comets Meteors and Asteroids Structure of a Comet

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Comets, Meteors, and Asteroids

Comets, Meteors, and Asteroids

Structure of a Comet Ion Tail Dust Tail Coma To Sun

Structure of a Comet Ion Tail Dust Tail Coma To Sun

Comet Structure 4 Nucleus o 10 km “Dirty Snowball” 4 Coma o Cloud of

Comet Structure 4 Nucleus o 10 km “Dirty Snowball” 4 Coma o Cloud of evaporated ices and ions o may be 100, 000 km in diameter 4 Tail o Always m. Due points away from Sun to Solar Wind & Radiation Pressure

The Oort Cloud 4 In 1950 Jan Oort noticed that mno comet has been

The Oort Cloud 4 In 1950 Jan Oort noticed that mno comet has been observed with an orbit that indicates that it came from interstellar space, mthere is a strong tendency for aphelia of long period comet orbits to lie at a distance of about 50, 000 AU, and mthere is no preferential direction from which comets come.

The Oort Cloud

The Oort Cloud

Comet Halley

Comet Halley

Bayeaux Tapestry Norman Invasion of 1066

Bayeaux Tapestry Norman Invasion of 1066

Comet Halley 1910 • Pope Callixtus III excommunicated Halley's Comet in 1456 • In

Comet Halley 1910 • Pope Callixtus III excommunicated Halley's Comet in 1456 • In 1910, charlatans sold "comet pills" Orbit

Comet Nucleus

Comet Nucleus

Comet of 1577

Comet of 1577

Comet Pons-Encke, 1804

Comet Pons-Encke, 1804

Hyakutake

Hyakutake

Hale-Bopp

Hale-Bopp

Comet West

Comet West

The Cause of Meteor Showers P 55/Tempel-Tuttle

The Cause of Meteor Showers P 55/Tempel-Tuttle

Why After Midnight is Best Midnight Rotational Velocity Orbital Velocity

Why After Midnight is Best Midnight Rotational Velocity Orbital Velocity

Shower Radiant The ‘leftovers’ of a comet. Apparent point of origin of a meteor

Shower Radiant The ‘leftovers’ of a comet. Apparent point of origin of a meteor shower.

Shower Radiant

Shower Radiant

The 1833 storm

The 1833 storm

The 1966 storm

The 1966 storm

1997 Leonids from Orbit

1997 Leonids from Orbit

Two Showers for Halley

Two Showers for Halley

Sporadic Meteors Irons Stony-Irons Carbonaceous Chondrites Achondrite

Sporadic Meteors Irons Stony-Irons Carbonaceous Chondrites Achondrite

Barringer’s Crater An iron meteorite 100 feet across and 70, 000 tons slamed into

Barringer’s Crater An iron meteorite 100 feet across and 70, 000 tons slamed into the Earth at about 43, 000 mph in the Arizona desert near Flagstaff 40, 000 years ago. Barringer Crater is 4, 100 feet wide and 571 feet deep.

Other Impact Craters

Other Impact Craters

Tunguska, 1908

Tunguska, 1908

How Much Damage?

How Much Damage?

Asteroids Apollo Trojans

Asteroids Apollo Trojans

Ida - Dactyl

Ida - Dactyl

Gaspra

Gaspra

Kirkwood Gaps

Kirkwood Gaps

Asteroids Elsewhere

Asteroids Elsewhere

Sedna

Sedna