Ast115
2-19-24
Asteroid -Rack +metal bigger than ~ 10m
meteorid - Rock t metal Smaller than N 10m
comet - De bris that is entlerly Rockt ice
Dwarfplanet - orbit the Sun t be round (But dosent Clear its arbH)
moon - Anobject or biting a larger object that orbits a star
lowercase noon/moons.
Comparative Planetologidy
most planets have nearly Circles orbits
All orbit counter Clockwise direction
most OF the planets are tilteld withless then 36°,
-
All Planets (except murcury + venus) have two moons,
4 close to the Sun, 4 Far away.
Small Mass
Largue Mass
small Selfer
Largue Size Serfes
High Dinsity
Low Dirsty
6.4 RadioActivety
i sotope 1 A element that has protones but # of Nentrons "C
°C
Halflife I amount of time For one/half of an Element to decay into sun
nofe stable
urmnum has halFlife of 95billon years it has been decaying
wartum 5% wanium
abillon years
25%
precent 4/2 billon Years later
2
