Ast1141Lec23Europa.pptx - Life on Europa? Astronomy 1141...

This preview shows page 1 - 7 out of 24 pages.

Life on Europa?Astronomy 1141
GanymedeCallistoIoEuropaGanymede and Callisto aremixedrockand ice.MoonIoand Europa aremostlyrocky.TheGalilean Moonsof Jupiter:
Galilean Moons: Evidence for a HotYoung JupiterOrbit in same sense,plane as JupiterÞFormed with JupiterÞSmall bodies shouldbe a mix of rock andiceDensities depend ondistance from JupiterClose = mostly rockFar = rock / ice mixÞIo was too hot tohave ice when itThe Moons of Jupiter arelike a mini solar system.
EuropaGanymedeCallistoIoThe inner three moons arethereforeregularlyperturbed bytheir neighbors.Io:1.8 daysEuropa:3.6 days(2 times Io's period)Ganymede:7.2 days(4 times Io's period)Callisto:16.7 daysOrbital Periods:The Galilean Moons all orbit in the samedirection around Jupiter.The inner 3 are onresonant orbits.
Too SmallNo AtmospheresToo BigHeavy AtmospheresLiquid H2O @ 1atmCold Interiors
Venus and Earth havehot,molteninteriors even after 4.5billion yearsMercury and Mars havecold,solidifiedinteriors today,VenusEarthMarsMercuryAmong the terrestrial planets, the amount ofinterior heat is determined by theplanet’s size.Kept hot by the decay of abundantradioactive isotopes in the interior.

Upload your study docs or become a

Course Hero member to access this document

Upload your study docs or become a

Course Hero member to access this document

End of preview. Want to read all 24 pages?

Upload your study docs or become a

Course Hero member to access this document

Term
Fall
Professor
Tendrup
Tags
Solar System, Io, Callisto, Orbital resonance

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture