ASTEROIDS COMETS METEOROIDS

Asteroids Most in the asteroid belt between Mars and Jupiter 3.09 Left over planet materials Most in the asteroid belt between Mars and Jupiter

Location: most lie between Mars and Jupiter

IDA

GASPRA

IDA & DACTYL

NEAR - Eros: Making Asteroid History: Feb. 2001 First orbit First soft landing First detailed study

The Surface of Eros

Comets “Snowy dirtballs” made of rock, ice, tar 3.09 Comets “Snowy dirtballs” made of rock, ice, tar Earliest material in solar system. Highly elliptical orbits.

Comet Hale-Bopp

Comets Nucleus, coma and tails. Ion tail points away from Sun. 3.09 Nucleus, coma and tails. Ion tail points away from Sun. Tails grows as comet approaches Sun.

Orientation of a comet’s tail as it orbits the Sun 3.10 DRAW

Meteoroids Small space rock moving through the solar system Sources: Interplanetary Debris Displaced Asteroid Debris Old Comets

Meteoroids Most <1mm in diameter 3.11 Most <1mm in diameter Most burn up (as meteors) when entering a planet’s atmosphere **Draw diagram on white board

Meteor An Meteoroid burning up in Earth’s atmosphere 3.11 An Meteoroid burning up in Earth’s atmosphere When many are burning= meteor shower

Meteorite 3.11 Any part of a meteoroid that is left after it impacts the planet Most are small

Meteor Crater, Arizona

STOP HERE