battle of the planets earth vs jupiter. small... rocky... liquid water... breathable atmosphere......
TRANSCRIPT
BATTLE OF THE PLANETSEARTH vs JUPITER
Small...Rocky...Liquid water...Breathable Atmosphere...
Huge...Gassy...- 160o C......can you breathe ammonia & methane?
solar nebular theory
• Nebula collapses due to gravity...
• Forms spinning disk with protosun in middle...
• Planetesimals form in disk...
• Protoplanets develop; denser matter gathers closer to center, while less dense matter accretes in the periphery...
• Fusion begins & blows away left-over dust & gas.
Inner & Outer planets• Inner planets
contain large percentages of heavy elements (Fe, Ni).
• Mercury, Venus, Earth & Mars.
• Small, rocky dense.
• Outer planets formed far away from sun (COLD!); kept their gases (H, He) and ices (methane, ammonia).
• Jupiter, Saturn, Uranus, Neptune.
• Large, gassy, low density.
Earth is...SO HOT!!!• HEAT from collisions (all those small
planetesimals banging into each other.
• HEAT from weight of layers piling on top of each other.
• HEAT from decay of radioactive materials within Earth.
DIFFERENTIATION
HEAT caused early Earth materials to be in a molten state.
Dense material (Fe, Ni) sank towards center...
Less dense material (Si) winds on top.
Core...mantle...crust.
Atmosphere• Less dense gases (H, He) rise to top &
become first Earth atmosphere; doesn’t last long (too light to be held by gravity).
• OUTGASSING from volcano eruptions releases water vapor, CO2, N2, CH4, SO2, NH4 to form second atmosphere.
• As life develops, organisms use CO2
during photosynthesis to arrive at present-day O2 atmosphere.
Where did all that water come from?Where did all that water come from?
Maybe from outer space!
• THEORY: Comets struck Earth, bringing ice/water to atmosphere.
• Rain resulting from comet ice/water gave Earth the oceans.
• Salt in oceans comes from land runoff.
• ...or maybe the water came from volcanoes...?
BATTLE OF THE PLANETS
(part II) EARTH vs Mars
Year = 365 daysMt Everest: 8 km highPlenty of malls...All your friends are here
Year = 687 days (you’d only be 8 yrs old...)Olympus Mons: 24 kmPossibility of H2O...